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Conditions A–Z Symptom checker

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Conditions A–Z

1,155 conditions, explained in plain language.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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22q11.2 deletion syndrome (DiGeorge syndrome)

A

Abdominal adhesions (scar tissue in the belly)
Abnormal blood vessels in the gut (angiodysplasia or GAVE)
Acanthosis nigricans (dark velvety skin)
Acetaminophen (Tylenol) overdose
Achalasia (food pipe won't relax)
Achilles tendinitis
Achilles tendon tear
Acid reflux (GERD)
Acne
Acoustic neuroma (vestibular schwannoma)
Acromegaly (too much growth hormone)
Actinic keratosis (sun damage spot)
Acute bronchitis (chest cold)
Acute liver failure
Acute respiratory distress syndrome (ARDS)
ADEM (brain and spinal cord inflammation after infection)
Adenomyosis
ADHD (attention-deficit/hyperactivity disorder)
Adjustment disorder (trouble coping with a life change)
Adrenal insufficiency (Addison's disease)
After an abortion (what's normal and warning signs)
Agoraphobia
Akathisia (inner restlessness from medicine)
Albinism
Alcohol or drug use disorder
Alcohol poisoning
Alcohol withdrawal
Alcohol-related liver damage (warning signs)
Alopecia areata (patchy hair loss)
Alpha-1 antitrypsin deficiency
Alpha-gal syndrome (red meat allergy from tick bites)
ALS (amyotrophic lateral sclerosis)
Altitude sickness
Amyloidosis
Anal abscess or fistula
Anal cancer (needs checking)
Anal fissure
Anal itching (pruritus ani)
Anal pain or spasm (proctalgia, levator ani syndrome)
Anaphylaxis (severe allergic reaction)
Anemia (low red blood cells)
Aneurysm of an artery in the body (not the aorta)
Angelman syndrome
Angina (chest pain from narrowed heart arteries)
Angioedema (deep swelling of the skin)
Ankle sprain
Ankylosing spondylitis
Ant stings (harvester, bullet, jack jumper, and velvet ants)
Anthrax
Antibiotic-resistant infections (superbugs like MRSA, CRE, or ESBL)
Antiphospholipid syndrome
Anxiety
Aortic aneurysm
Aortic dissection (tear in the main artery)
Aortic stenosis (narrowed heart valve)
Aphasia (trouble with language)
Aplastic anemia
Appendicitis
Arachnoid cyst (fluid sac on the brain)
Arachnoiditis (inflamed spinal nerve lining)
Artery problems from repeated strain (hypothenar hammer or popliteal entrapment)
Asbestos lung disease (asbestosis or mesothelioma)
Aspiration pneumonia (inhaling food or vomit)
Asthma
Ataxia (loss of coordination)
Athlete's foot
Atrial fibrillation (AFib)
Atrial flutter
Attachment disorders in children
Autism
Autoimmune hepatitis
Autonomic dysfunction (dysautonomia)
Autonomic dysreflexia
Axillary or suprascapular nerve injury (shoulder nerve)

B

Babesiosis
Baby acne and milia
Baby constipation
Baby not feeding well or not gaining weight
Baby spit-up (infant reflux)
Bacterial vaginosis (BV)
Bad breath (halitosis)
Baker's cyst
Balance nerve damage on both sides (bilateral vestibulopathy)
Balanced chromosome translocation (carrier)
Ball-of-foot pain (metatarsalgia)
Barrett's esophagus
Bartholin cyst
Bed bugs
Bedsores (pressure injuries)
Bedwetting
Bee, wasp, hornet, or yellow jacket sting
Behcet's disease
Bell's palsy (peripheral facial nerve palsy)
Belly injury (bleeding inside from a spleen, liver, or kidney injury)
Belly muscle separation (diastasis recti)
Belly tumor in a child (Wilms tumor or neuroblastoma) (needs checking)
Biceps or triceps tendon tear
Bicuspid aortic valve
Bile duct infection or inflammation (cholangitis)
Biliary atresia (jaundice with pale stools in a baby)
Biotin deficiency
Bipolar disorder
Bird flu (avian influenza)
Birth control side effects
Birthmarks (stork bites, Mongolian spots, and moles)
Black hairy tongue
Bladder cancer (needs checking)
Bleeding after menopause (needs checking)
Bleeding around the brain after a head injury (subdural or epidural hematoma)
Bleeding disorder (hemophilia or von Willebrand disease)
Bleeding in the digestive tract (vomiting blood or black stools)
Bleeding inside the eye (vitreous hemorrhage)
Blister beetle burns
Bloating that won't go away (needs checking)
Blocked blood flow to the intestines (mesenteric ischemia)
Blocked large vein (superior vena cava syndrome)
Blocked or infected tear duct
Blocked stomach outlet (gastric outlet obstruction or volvulus)
Blood clot in the brain's veins (cerebral venous thrombosis)
Blood clot in the leg (deep vein thrombosis)
Blood clot in the lung (pulmonary embolism)
Blood in the urine (needs checking)
Blood transfusion reaction
Blood under a nail (subungual hematoma)
Blood vessel malformations in the brain (AVM or cavernoma)
Body clock sleep disorders (shift work, early sleep, non-24)
Body dysmorphic disorder
Body integrity dysphoria
Body lice
Boil or skin abscess
Bone cyst or benign bone lesion
Bone death from poor blood flow (avascular necrosis)
Bone infection (osteomyelitis)
Bone or soft tissue cancer (sarcoma) (needs checking)
Bone spurs and heel spurs
Borderline personality disorder
Botulism (from food)
Bowel changes or bleeding (needs checking)
Bowel leakage (fecal incontinence)
Bowel obstruction (blocked intestine)
Boxer's fracture (hand bone broken from a punch)
Brachial plexus injury (stinger or burner)
Brain aneurysm or brain bleed
Brain injury from lack of oxygen
Brain tumor (needs checking)
Breast cancer (needs checking)
Breast implant or breast surgery problems
Breast pain
Breath-holding spells
Breathing too little during sleep (sleep-related hypoventilation)
Breech baby (baby not head-down)
Brittle bone disease (osteogenesis imperfecta)
Brittle or splitting nails
Broken arm or wrist
Broken blood vessel in the eye (subconjunctival hemorrhage)
Broken bone in the foot
Broken bone that isn't healing (nonunion or malunion)
Broken collarbone
Broken finger
Broken lower leg (tibia or fibula fracture)
Broken neck or back (spine fracture)
Broken nose
Broken pelvis (pelvic fracture)
Broken thighbone (femur fracture)
Broken toe
Bronchiectasis
Bronchiolitis (RSV)
Brucellosis
Bruised or cracked rib
Bruises
Budd-Chiari syndrome and liver vein blockage
Buerger's disease
Bumps on a newborn's head (cephalohematoma or caput)
Bunion
Burning mouth syndrome
Burning red hands or feet (erythromelalgia)
Bursitis of the elbow or knee
Burst eardrum

C

C-section recovery and wound problems
C. diff infection
CADASIL (inherited small-vessel stroke disease)
Caffeine withdrawal headache
Can't pee (urinary retention)
Cancer treatment side effects
Canker sores (mouth ulcers)
Cannabis hyperemesis syndrome
Carbon monoxide poisoning
Carcinoid or neuroendocrine tumor
Cardiomyopathy (weak or thickened heart muscle)
Caring for a cast, splint, or boot
Carpal tunnel syndrome
Cassava poisoning (konzo)
Cat scratch disease
Cataracts
Catatonia
Caterpillar sting (stinging caterpillars)
Cauda equina syndrome
Cauliflower ear (blood under the ear skin)
Celiac disease
Cellulite
Cellulitis
Central serous chorioretinopathy
Cerebral palsy
Cervical polyps or ectropion
Cervical precancer or cancer (needs checking)
Cervicitis (inflamed cervix)
Chafing and skin-fold rash (intertrigo)
Chagas disease
Chancroid
Changing mole or spot (needs checking)
Charcot foot (diabetic nerve-damaged joint)
Charcot-Marie-Tooth disease
Chemical burn on the skin
Cherry angiomas
Chest wall pain (costochondritis)
Chiari malformation
Chickenpox
Chigger bites
Chilblains
Chlamydia
Chlamydia or gonorrhea eye infection
Cholera
Cholesteatoma (skin growth in the middle ear)
Chorea (dance-like jerky movements)
Chronic fatigue syndrome (ME/CFS)
Chronic hives
Chronic kidney disease
Chronic low back pain
Chronic pelvic pain
Chronic stuffy or runny nose (non-allergic rhinitis)
CIDP (long-lasting nerve inflammation)
Cirrhosis (liver scarring)
Cleft lip and palate
Clubfoot
Cluster headache
Cold sores
Colic
Collapsed lung (pneumothorax)
Collapsed part of the lung (atelectasis)
Colon polyps
Color blindness
Colorectal cancer (colon or rectal cancer) (needs checking)
Common cold
Common hair loss or shedding
Common pregnancy discomforts
Common warts
Compartment syndrome
Complex regional pain syndrome (CRPS)
Compulsive sexual behavior disorder
Concussion
Conduct disorder
Congenital myasthenic syndromes
Congenital myopathies
Constipation
Contact dermatitis
Contact lens eye infection (keratitis)
Convergence insufficiency (eyes don't team up up close)
COPD (chronic lung disease)
Copper deficiency
Corneal dystrophy and swelling (Fuchs and others)
Corns and calluses
Coronary spasm and small-vessel heart disease
Coughing up blood (hemoptysis)
COVID-19
Cracked mouth corners (angular cheilitis)
Cracked or broken tooth
Cradle cap
Craniosynostosis
Craving ice or non-food items (pica)
Creeping eruption (hookworm larvae in the skin)
Creutzfeldt-Jakob disease (CJD)
Cri-du-chat syndrome (5p deletion)
Crohn's disease or ulcerative colitis (IBD)
Croup
Crush injury
Cryoglobulinemia
Cushing's syndrome
Cut or puncture wound
Cut tendon or nerve in the hand or arm
Cut-off finger, hand, or limb (traumatic amputation)
Cyclic vomiting syndrome
Cystic fibrosis
Cystocele or rectocele (bladder or rectum bulging into the vagina)
Cytomegalovirus (CMV)

D

Damaged nasal septum
Dark spots and melasma
Dark streak in a nail (needs checking)
De Quervain's tenosynovitis
Deep neck abscess (retropharyngeal or parapharyngeal)
Dehydration
Delayed sleep phase (night owl body clock)
Depression
Depression during or after pregnancy
Dermatitis herpetiformis (celiac skin rash)
Developmental or speech delay (needs checking)
Deviated septum
Diabetes (high blood sugar)
Diabetic amyotrophy (lumbosacral plexopathy)
Diabetic eye disease (diabetic retinopathy)
Diabetic foot ulcer
Diaper rash
DIC (widespread clotting and bleeding)
Differences in uterus shape (septate or bicornuate uterus)
Diphtheria
Dislocated joint
Dislocated lens or missing lens of the eye
Disorders of consciousness (coma, vegetative, locked-in)
Dissociation (feeling unreal)
Diverticulitis
Diverticulosis (pouches in the colon)
Diving injuries (decompression sickness and barotrauma)
Dizziness when standing up (orthostatic hypotension)
Double vision (diplopia)
Down syndrome
Droopy eyelid (ptosis)
Drowning or near-drowning
Dry eye
Dry mouth (xerostomia)
Dry skin
Dry socket
Dumping syndrome
Dupuytren's contracture
Dust-related lung disease (silicosis, black lung, berylliosis)
Dwarfism (achondroplasia and other skeletal dysplasias)
Dyshidrotic eczema
Dyslexia and learning disabilities
Dystonia

E

Ear infection
Ear shape differences and ear tags
Earache, ear drainage, or ear bleeding
Early gray hair
Early menopause (primary ovarian insufficiency)
Early or late puberty
Earwax buildup or plugged ears
Easy bruising or bleeding (needs checking)
Eating disorder
Ebola and other viral hemorrhagic fevers
Ectopic pregnancy
Eczema
Elbow fracture
Electrical injury (electric shock)
Encephalitis (inflamed brain)
Encephalopathy (brain not working right from illness or toxins)
Endocarditis (infected heart valve)
Endometriosis
Endophthalmitis (infection inside the eye)
Enlarged liver (hepatomegaly)
Enlarged prostate (BPH)
Enlarged spleen (splenomegaly)
Enlarged tonsils or adenoids
Eosinophilic esophagitis (EoE)
Eosinophilic fasciitis
Eosinophilic gastroenteritis (allergic stomach and gut inflammation)
Epidermolysis bullosa (fragile, blistering skin)
Epididymitis
Epiglottitis
Epilepsy and seizures
Erectile dysfunction (ED)
Erythema multiforme
Erythema nodosum
Esophageal cancer (needs checking)
Esophageal spasm and swallowing motility problems
Esophageal varices
Esophagitis (inflamed food pipe)
Essential tremor
Eustachian tube problems (plugged or popping ears)
Excessive startle (hyperekplexia)
Excessive sweating (hyperhidrosis)
Exploding head syndrome
Extra nipple
Extra, fused, or curved fingers or toes
Eye cancer in a child (retinoblastoma) (needs checking)
Eye floaters
Eye injury from a hit (black eye, bleeding inside the eye, or broken eye socket)
Eye movement nerve palsy (3rd, 4th, or 6th nerve)
Eye strain headache
Eye stroke (retinal artery or vein blockage)
Eye that won't close fully (lagophthalmos)
Eyelid inflammation (blepharitis)
Eyelid turning in or out (entropion or ectropion)
Eyelid twitching

F

Factitious disorder
Fainting (syncope)
Falls and fall risk
False labor (Braxton Hicks contractions)
Fatty liver disease
Feeling bugs on the skin when none are found
Female genital cutting (FGM)
Femoral nerve injury
Fetal alcohol spectrum disorder (FASD)
Fever after international travel (such as malaria or dengue)
Fever in a newborn (under 3 months)
Fever seizure in a child (febrile seizure)
Fever with no clear cause (fever of unknown origin)
Fibrocystic breasts
Fibromuscular dysplasia (FMD)
Fibromyalgia
Fifth disease (slapped cheek)
Fire ant bites
Fistula between bladder, vagina, or rectum (obstetric fistula)
Flat feet
Flat head (plagiocephaly)
Flea bites
Flesh-eating infection (necrotizing fasciitis)
Fluid around the heart (pericardial effusion or tamponade)
Fluid in the belly (ascites)
Fluid in the lungs (pulmonary edema)
Folate (folic acid) deficiency
Folliculitis and razor bumps
Food allergy
Food poisoning
Foot drop (peroneal nerve palsy)
Forgotten tampon or object in the vagina
FPIES (delayed food allergy with vomiting in babies)
Fragile X syndrome
Friction blisters
Frostbite
Frozen shoulder
Functional neurological disorder (FND)
Fungal lung infection (valley fever, histoplasmosis, blastomycosis, or aspergillosis)

G

H

Hair loss from tight hairstyles (traction alopecia)
Hair pulling, skin picking, or nail biting
Hammer toe or claw toe
Hamstring strain
Hand, foot, and mouth disease
Hangover
Hantavirus
Hardened arteries (atherosclerosis)
Harmless extra heartbeats (palpitations)
Harmless muscle twitching
Harmless sleep jerks in babies (benign neonatal sleep myoclonus)
Head injury and skull fracture (traumatic brain injury)
Head lice
Health anxiety (illness anxiety)
Hearing loss
Heart attack
Heart block (slow or blocked heart signals)
Heart defect present from birth (congenital heart defect)
Heart failure
Heart murmur or valve problem
Heart rhythm problem (arrhythmia)
Heat exhaustion
Heat rash
Heatstroke
Heavy bleeding after birth (postpartum hemorrhage)
Heavy cannabis use (cannabis use disorder)
Heavy menstrual bleeding
Hemangioma (strawberry mark)
Hemifacial spasm (twitching on one side of the face)
Hemochromatosis (iron overload)
Hemolytic anemia (including G6PD deficiency)
Hemolytic uremic syndrome (HUS)
Hemorrhoids
Hepatitis A
Hepatitis B
Hepatitis C
Hepatitis D and E
Hepatitis or liver inflammation
Hereditary sensory and autonomic neuropathy
Hernia
Herniated disc (slipped disc)
Herpangina
Herpetic whitlow (herpes on the finger)
Hiccups that won't stop
Hidradenitis suppurativa
High arches (pes cavus)
High blood pressure (hypertension)
High cholesterol
High inflammation markers (CRP or ESR)
High liver enzymes on a blood test
High platelet count (thrombocytosis)
High pressure inside the skull (brain swelling)
High white blood cell or eosinophil count
Hip bursitis
Hip dysplasia
Hip fracture (broken hip)
Hip impingement and labral tear
Hip osteoarthritis
Hirschsprung disease
Hirsutism (extra hair growth)
HIV
Hives
HLH (immune system overreaction)
Hoarding
Hole between the upper heart chambers (PFO or ASD)
Horner syndrome
Horse fly, deer fly, and other biting fly bites
HPV infection
HTLV-1 myelopathy (tropical spastic paraparesis)
Hunger headache
Huntington's disease
Hydrocele
Hydrocephalus (fluid on the brain)
Hyperkalemia (high potassium in the blood)
Hypersensitivity pneumonitis (farmer's lung, bird fancier's lung)
Hypersomnia (excessive sleepiness)
Hypertensive crisis (dangerously high blood pressure)
Hyponatremia (low sodium in the blood)
Hypospadias (urine opening not at the tip of the penis)
Hypothermia (low body temperature)

I

IgG4-related disease
Ileus (intestines stop moving)
Immune deficiency (including SCID)
Imperforate hymen
Impetigo
Impulse control disorders (kleptomania or pyromania)
Indoor allergies (dust, pets, or mold)
Infected ear cartilage (perichondritis)
Infected nail fold (paronychia)
Infected surgical wound (surgical site infection)
Infection after giving birth (postpartum infection)
Inflamed cornea not from contact lenses (keratitis)
Inflamed eye (iritis or uveitis)
Inflamed head of the penis (balanitis)
Inflamed muscles (dermatomyositis or polymyositis)
Inflamed or chapped lips (cheilitis)
Inflamed tongue (glossitis)
Influenza (flu)
Ingrown toenail
Inhalant and whippet use
Inherited retinal diseases (retinitis pigmentosa and others)
Injury to the testicles, penis, or vulva
Insect bites and stings
Insomnia
Intercostal neuralgia (rib nerve pain)
Interstitial cystitis (painful bladder syndrome)
Interstitial lung disease
Intestinal worms (roundworm or tapeworm)
Intussusception
Iodine deficiency
Iron-deficiency anemia
Irregular or abnormal periods (abnormal uterine bleeding)
Irritable bowel syndrome (IBS)
IT band syndrome
Itchy rash or itching in pregnancy
Itchy skin (pruritus)

J

Jammed finger or mallet finger
Jaw cyst
Jaw injury or dislocated jaw
Jaw joint problem (TMJ disorder)
Jellyfish sting
Jet lag
Jock itch
Joint hypermobility (including Ehlers-Danlos syndrome)
Joint infection (septic arthritis)
Juvenile arthritis

K

Kawasaki disease
Keloid
Keratoconus
Keratosis pilaris (chicken skin)
Kidney cancer (needs checking)
Kidney cysts
Kidney differences from birth (single, horseshoe, or pelvic kidney)
Kidney infection
Kidney inflammation (glomerulonephritis or IgA nephropathy)
Kidney stones
Kissing bug or assassin bug bite
Klinefelter syndrome
Knee ligament or meniscus injury
Knee osteoarthritis
Kneecap dislocation (dislocated patella)
Knocked-out or loosened tooth (dental injury)

L

Labial adhesions
Lactose intolerance
Lambert-Eaton syndrome
Large baby (macrosomia)
Laryngitis
Lasting hoarseness or trouble swallowing (needs checking)
Latex allergy
Lazy eye or crossed eyes (amblyopia or strabismus)
Lead exposure
Legionnaires' disease
Leishmaniasis
Leprosy (Hansen's disease)
Leptospirosis
Leukemia (blood cancer) (needs checking)
Leukodystrophies
Leukoplakia (white patch in the mouth)
Lichen planus
Lichen sclerosus
Lichen simplex chronicus (thick itchy skin from scratching)
Limp in a child (needs checking)
Lip bump (mucocele)
Lipedema
Lipoma (fatty lump)
Liver abscess
Liver cancer (needs checking)
Liver cysts and polycystic liver
Liver injury from medicines or supplements
Living with chronic pain
Living without a working spleen (asplenia)
Loneliness
Long COVID
Loss of smell (anosmia)
Low blood sugar (hypoglycemia)
Low breast milk supply
Low platelets (ITP or thrombocytopenia)
Low testosterone
Low white blood cell count (neutropenia)
Lump in the throat feeling (globus)
Lump or swollen gland that won't go away (needs checking)
Lumps in the mouth from irritation (oral fibroma)
Lung abscess or pus around the lung (empyema)
Lung cancer (needs checking)
Lung injury from chemical fumes or smoke
Lupus
Lyme disease
Lymphangioleiomyomatosis (LAM)
Lymphedema
Lymphogranuloma venereum (LGV)
Lymphoma (needs checking)

M

Macular degeneration
Macular hole and macular problems
Maggots in a wound (myiasis)
Magnesium deficiency
Malabsorption (gut can't absorb food)
Malaria
Malignant hyperthermia (reaction to anesthesia)
Malignant otitis externa (spreading ear canal infection)
Mallory-Weiss tear (bleeding after hard vomiting)
Malnutrition
Marchiafava-Bignami disease
Marfan syndrome
Mastitis
Mastoiditis
Measles
Meckel's diverticulum
Medication-overuse headache
Medicine allergy or side effect
Memory loss and dementia
Meniere's disease
Meningitis
Metabolic syndrome
Methemoglobinemia (blue skin from changed blood)
Migraine
Milky nipple discharge (galactorrhea)
Minor burn
Misaligned teeth or bite (malocclusion)
Missed periods (amenorrhea)
Missing or extra teeth
Mitochondrial disease
Mitral valve prolapse
Mixed connective tissue disease
Molar pregnancy
Molluscum contagiosum
Mononucleosis (mono)
Morning headaches from poor sleep or sleep apnea
Morphea (localized scleroderma)
Morton's neuroma
Mosquito bites
Motion sickness
Mouth sore or patch that won't heal (needs checking)
Mouth sores from cancer treatment (oral mucositis)
Mouth, throat, or voice box cancer (needs checking)
Moyamoya disease
Mpox
Multiple myeloma (needs checking)
Multiple sclerosis (MS)
Multiple system atrophy (MSA)
Mumps
Muscle aches (myalgia)
Muscle breakdown (rhabdomyolysis)
Muscle cramps
Muscle pain or weakness from medicines
Muscle strain or low back pain
Muscular dystrophy
Mushroom poisoning (including amatoxin or death cap)
Myasthenia gravis
Mycoplasma genitalium
Myelodysplastic syndrome (MDS)
Myocarditis (inflamed heart muscle)
Myoclonus (sudden muscle jerks)
Myotonic dystrophy and myotonia

N

Nail changes (pitting, lifting, ridges, or thickening)
Nail fungus
Narcolepsy
Narrowed esophagus or pouch (stricture, web, or diverticulum)
Narrowed neck artery (carotid stenosis)
Narrowed windpipe or tracheostomy problems
Nasal polyps
Nasal spray overuse (rebound congestion)
Nausea and vomiting of pregnancy (morning sickness)
Neck and upper back pain from posture (tech neck)
Neck arthritis (cervical spondylosis)
Neck injury from choking, strangulation, or a hanging attempt
Neck lump in a baby or child (needs checking)
Neck-related headache (cervicogenic)
Needing glasses (nearsighted, farsighted, or age-related)
Nephrotic syndrome
Nerve pain after shingles (postherpetic neuralgia)
Nerve pain and phantom limb pain
Neuralgic amyotrophy (Parsonage-Turner syndrome)
Neurofibromatosis
Neuromyelitis optica (NMOSD or MOGAD)
New breast lump (needs checking)
Newborn breathing problems
Newborn jaundice
Newborn withdrawal (neonatal abstinence syndrome)
Niacin (vitamin B3) deficiency (pellagra)
Nicotine or vaping dependence
Nightmares and nightmare disorder
Noisy breathing in babies (laryngomalacia)
Normal pressure hydrocephalus
Nosebleed
Not sweating enough (hypohidrosis)
Numb or burning outer thigh (meralgia paresthetica)
Nummular eczema (coin-shaped patches)
Nursemaid's elbow
Nystagmus (shaking or jumping eyes)

O

Obesity
Object stuck in the ear or nose
Object stuck in the rectum or around the penis
Occipital neuralgia
OCD (obsessive-compulsive disorder)
Olfactory reference disorder (fear of smelling bad)
Ongoing tiredness (fatigue)
Opioid use and dependence
Oppositional defiant disorder (ODD)
Optic nerve stroke or damage (optic neuropathy)
Optic neuritis (inflamed optic nerve)
Oral thrush (yeast in the mouth)
Orbital cellulitis (infection around the eye)
Osgood-Schlatter disease
Osmotic demyelination (central pontine myelinolysis)
Osteoarthritis in several joints (wear-and-tear arthritis)
Osteoarthritis of the hand
Osteochondritis dissecans (loose piece of bone in a joint)
Osteoporosis (bone loss)
Ostomy problems (colostomy, ileostomy, or feeding tube)
Otosclerosis
Ovarian cancer (needs checking)
Ovarian cyst
Overactive bladder
Overactive parathyroid (hyperparathyroidism)
Overactive thyroid (hyperthyroidism)

P

Pacemaker or defibrillator problems
Paget's disease of bone
Pain after gallbladder removal (sphincter of Oddi problems)
Painful nodule on the ear (chondrodermatitis nodularis)
Painful sex (dyspareunia)
Pale patches on the skin (pityriasis alba or after a rash)
Pancreas not making enough digestive enzymes (EPI)
Pancreatic cancer (needs checking)
Pancreatic cysts and pseudocysts
Pancreatitis
Panic attacks
Panniculitis (inflamed fat under the skin)
Paraneoplastic neurological syndromes
Paraphilic disorders
Parasite diarrhea (giardia, cryptosporidium, or cyclospora)
Parkinson's disease
Parrot fever (psittacosis)
Partly collapsed lung (atelectasis)
Pattern hair loss (male or female pattern)
Peeing a lot or very often (frequent urination or polyuria)
Pelvic floor dysfunction
Pelvic girdle pain in pregnancy (SPD)
Pelvic inflammatory disease (PID)
Pelvic organ prolapse
Pemphigus and pemphigoid (blistering skin diseases)
Penile cancer (needs checking)
Pericarditis (inflamed sac around the heart)
Perilymph fistula (inner ear leak)
Perimenopause and menopause
Period cramps (dysmenorrhea)
Periodic fever syndromes (including FMF)
Periodic paralysis
Perioral dermatitis
Peripheral artery disease (poor leg circulation)
Peripheral neuropathy
Peritonitis
Persistent depressive disorder (long-term low mood)
Personality disorders
Peyronie's disease (curved penis)
Phenylketonuria (PKU)
Phobia
Pilonidal cyst
Pinched nerve in the neck (cervical radiculopathy)
Pinguecula and pterygium (growths on the white of the eye)
Pink eye (conjunctivitis)
Pinworms
Piriformis syndrome
Pityriasis rosea
Placenta problems (placenta previa or placental abruption)
Plague
Plantar fasciitis
Pleurisy (inflamed lung lining)
PMDD (premenstrual dysphoric disorder)
PML (rare brain infection in weak immune systems)
Pneumonia
Poison ivy, oak, or sumac rash
Polio
Pollen-food allergy (oral allergy syndrome)
Polycystic kidney disease (PKD)
Polycystic ovary syndrome (PCOS)
Polycythemia (too many red blood cells)
Polymyalgia rheumatica
Polyps in the stomach or small intestine
Poor vein circulation and leg ulcers (venous insufficiency)
Porphyria
Portal hypertension (high pressure in the liver veins)
Positive ANA test
Possible broken ankle
Possible child abuse or neglect (needs checking)
Possible pregnancy
Possible rabies exposure
Possible STI exposure (testing needed)
Post-concussion syndrome
Postnasal drip
POTS (postural orthostatic tachycardia syndrome)
PPPD (persistent dizziness)
Prader-Willi syndrome
Prediabetes
Preeclampsia (pregnancy headache warning)
Pregnancy loss (miscarriage)
Premature baby (born early)
Premature ejaculation
Premenstrual syndrome (PMS)
Preterm labor
Priapism (erection that won't go away)
Primary biliary cholangitis (PBC)
Primary ciliary dyskinesia
Problems after a butt lift or butt injections
Problems after an amputation (stump pain, sores, or infection)
Problems after cosmetic procedures (fillers, Botox, peels, laser)
Problems after fertility treatment (OHSS)
Problems with a joint replacement
Prostate cancer (needs checking)
Prostatitis
Protein in the urine (proteinuria)
Prurigo nodularis (very itchy hard bumps)
Pseudogout (CPPD)
Pseudotumor cerebri (idiopathic intracranial hypertension)
Psoriasis
Psoriatic arthritis
Psychosis or schizophrenia
PTSD (post-traumatic stress disorder)
Pubic lice (crabs)
Pulmonary fibrosis (lung scarring)
Pure red cell aplasia
Pyloric stenosis
Pyoderma gangrenosum

Q

Q fever
Quadriceps or patellar tendon tear

R

Radiation injury to the brain or nerves
Radiation or medicine damage to the intestines
Ramsay Hunt syndrome (shingles of the ear)
Raynaud's phenomenon
Reactive arthritis
Receding or swollen gums
Recovering from a broken bone
Rectal prolapse
Rectal STI (proctitis)
REM sleep behavior disorder (acting out dreams)
Respiratory failure
Restless legs syndrome
Retinal detachment
Retinitis pigmentosa
Retinopathy of prematurity (ROP)
Rett syndrome
Reye's syndrome
Rh disease and blood type problems in pregnancy
Rheumatic fever
Rheumatoid arthritis
Rhythmic movements during sleep (head banging or body rocking)
Riboflavin (vitamin B2) deficiency
Rickets and soft bones (osteomalacia)
Ringworm (fungal skin infection)
Rocking feeling after travel (mal de debarquement)
Rodent exposure (bites or droppings)
Rosacea
Roseola
Rotator cuff injury
Round ligament pain (pregnancy)
Rubella (German measles)
Runner's knee (patellofemoral pain)

S

Salivary gland stones or infection
Salmonella from pets (reptiles or backyard chickens)
Samter's triad (aspirin-sensitive asthma with nasal polyps)
SAPHO syndrome
Sarcoidosis
Scabies
SCAD (tear in a heart artery)
Scalp ringworm (tinea capitis)
Scarlet fever
Scarring hair loss (cicatricial alopecia)
Sciatica
Scleritis and episcleritis (inflamed white of the eye)
Scleroderma (systemic sclerosis)
Scoliosis
Scorpion sting
Scratched eye or something in the eye (corneal abrasion)
Seasonal allergies (hay fever)
Seasonal depression (seasonal affective disorder)
Seborrheic dermatitis (dandruff)
Seborrheic keratosis
Seeing things from vision loss (Charles Bonnet syndrome)
Selective mutism
Self-harm (hurting yourself on purpose)
Separated shoulder (AC joint injury)
Separation anxiety
Sepsis
Serious burn (deep, large, or on the face, hands, or genitals)
Serious chest injury (flail chest, bruised lung, or bleeding in the chest)
Serious drug rash (DRESS or AGEP)
Sever's disease (heel pain in active kids)
Severe sunburn (sun poisoning)
Severe vomiting in pregnancy (hyperemesis gravidarum)
Sexual problems (low desire, arousal, or orgasm)
Shin splints
Shingles
Shock (dangerously low blood flow)
Short bowel syndrome
Short stature in children (short for age)
Shoulder dislocation (dislocated shoulder)
Sickle cell disease
Side effects after a vaccine (including the COVID-19 shot)
Sideroblastic anemia
Sinus infection (sinusitis)
Sjögren's syndrome
Skin cancer (basal cell or squamous cell) (needs checking)
Skin changes from diabetes
Skin cyst (epidermoid cyst)
Skin damage from radiation therapy
Skin infections and wounds from injecting
Skin popping injuries (injecting under the skin or into muscle)
Skin tags
Skin-picking disorder (excoriation disorder or neurotic excoriations)
Sleep paralysis
Sleepwalking and night terrors
Slipped capital femoral epiphysis (SCFE)
Slow heart rate (bradycardia)
Small baby (growth restriction or small for gestational age)
Small intestinal bacterial overgrowth (SIBO)
Smallpox and related poxviruses
Snakebite (venomous snake bite)
Social anxiety
Somatic symptom disorder (bodily distress)
Someone else's blood or body fluids got on you (blood exposure)
Something inhaled into the airway (child coughing after choking)
Something stuck under the skin (splinter, glass, or other object)
Sore nipples or engorgement while breastfeeding
Sore throat (pharyngitis)
Spider bites (including black widow and brown recluse)
Spina bifida
Spinal accessory nerve injury
Spinal cord compression or damage (myelopathy)
Spinal cord injury
Spinal fluid leak headache (low pressure headache)
Spinal muscular atrophy (SMA)
Spinal stenosis
Spine curves (kyphosis or lordosis)
Spine infection (vertebral osteomyelitis or discitis)
Spondylolisthesis (slipped vertebra)
Staph scalded skin syndrome
Stereotypies (repeated movements)
Stevens-Johnson syndrome (SJS/TEN)
Stiff big toe (hallux rigidus)
Stillbirth (baby dies before birth)
Stimulant use (meth or cocaine)
Stomach cancer (needs checking)
Stool stuck in the rectum (fecal impaction)
Strep throat
Stress and burnout
Stress fracture
Stress urinary leakage (stress incontinence)
Stretch marks
Stroke
Stuttering
Stye or chalazion (eyelid bump)
Subclavian steal syndrome
Sudden cardiac arrest
Sudden confusion in an older adult (delirium)
Sudden infant death syndrome (SIDS)
Sudden kidney problem (acute kidney injury)
Sudden loss of blood flow to an arm or leg (acute limb ischemia)
Sun allergy (polymorphous light eruption)
Sun-damaged skin (photoaging and sun spots)
Sunburn
Sunken or pigeon chest (pectus excavatum or carinatum)
Sunken or widened scars
Superficial siderosis
Superficial vein clot (thrombophlebitis)
Superior canal dehiscence (thin bone over the inner ear)
Surfer's ear (bony growths in the ear canal)
SVT (sudden fast heart rhythm)
Swallowed object
Sweet syndrome (sudden painful red bumps with fever)
Swelling in the legs, ankles, or body (edema)
Swimmer's ear (outer ear infection)
Swollen breast tissue in males (gynecomastia)
Swollen kidney from blocked urine (hydronephrosis)
Swollen lymph nodes (lymphadenitis)
Syphilis
Syringomyelia (fluid-filled cyst in the spinal cord)

T

Tailbone pain (coccydynia)
Tarsal tunnel syndrome
Tattoo reactions
Tay-Sachs disease
Tear in a neck or brain artery (arterial dissection)
Tearing during birth (perineal tear)
Teeth grinding (bruxism)
Teething
Tennis elbow
Tension headache
Testicle lump (needs checking)
Tetanus (lockjaw)
Thalassemia
Thiamine (vitamin B1) deficiency
Thick skin on palms and soles (keratoderma)
Thin, fragile skin (skin atrophy)
Thoracic outlet syndrome
Thunderclap headache from narrowed brain arteries (RCVS)
Thyroid eye disease (bulging eyes)
Thyroid nodule or thyroid cancer (needs checking)
Thyroiditis (inflamed thyroid)
Tick bite
Tick fever (such as Rocky Mountain spotted fever)
Tics and Tourette syndrome
Tight foreskin (phimosis or paraphimosis)
Tinea versicolor
Tinnitus (ringing in the ears)
Toasted skin rash (erythema ab igne)
Toe walking, in-toeing, or bowlegs in kids
Tongue tie
Tongue weakness (hypoglossal nerve palsy)
Tonsil stones
Tonsillitis
Too much caffeine (caffeine overuse)
Too much or too little amniotic fluid
Tooth abscess (tooth infection)
Tooth decay (cavity)
Toothache from an inflamed nerve (pulpitis)
Torn esophagus (Boerhaave syndrome)
Toxic megacolon
Toxic shock syndrome
Toxoplasmosis (cat litter or raw meat in pregnancy)
Transient global amnesia
Transplant rejection and transplant problems
Transverse myelitis (inflamed spinal cord)
Traumatic neuroma (painful nerve after injury)
Traveler's diarrhea
Tremor from other causes
Trench foot (immersion foot)
Trichinosis
Trichomoniasis
Trichotillomania (hair-pulling disorder)
Trigeminal neuralgia
Trigger finger
Triple X syndrome (47,XXX)
Trouble controlling anger
Trouble getting pregnant (infertility)
Tuberculosis (TB)
Tuberous sclerosis
Turf toe
Turner syndrome
Twin or multiple pregnancy
Twisted ovary (ovarian torsion)
Twisted testicle (testicular torsion)

U

Ulnar nerve compression (cubital tunnel)
Umbilical cord stump care
Underactive parathyroid (hypoparathyroidism)
Underactive pituitary (hypopituitarism)
Underactive thyroid (hypothyroidism)
Undescended testicle
Unequal pupils (anisocoria)
Unsafe relationship or abuse
Urethral prolapse or caruncle
Urethritis
Urinary tract infection (UTI)
Uterine (endometrial) cancer (needs checking)
Uterine fibroids

V

Vaginal cancer (needs checking)
Vaginal yeast infection
Vaginitis (vaginal inflammation)
Varicocele
Varicose and spider veins
Vasculitis (inflamed blood vessels)
Ventricular tachycardia (dangerous fast heartbeat)
Vertigo (BPPV)
Vestibular neuritis (inner ear inflammation)
Viral gastroenteritis (stomach bug)
Viral rash (viral exanthem)
Vision loss or blindness
Visual field loss (missing parts of vision)
Vitamin A deficiency
Vitamin B12 deficiency
Vitamin B6 deficiency
Vitamin C deficiency (scurvy)
Vitamin D deficiency
Vitamin E deficiency
Vitamin K deficiency
Vitiligo
Vocal cord problems (nodules, polyps, or paralysis)
Vomiting in a newborn (green vomit is an emergency)
Vulvar hematoma (bruise and swelling)
Vulvar pain (vulvodynia or vaginismus)
Vulvar precancer, cancer, or melanoma (needs checking)

W

Water breaking early (rupture of membranes)
Weak cervix (cervical insufficiency)
West Nile virus
Whiplash
White or brown spots on teeth (fluorosis or enamel defects)
Whooping cough (pertussis)
Wilson disease
Winged shoulder blade (long thoracic nerve injury)
Wisdom tooth pain
Wolf-Hirschhorn syndrome (4p deletion)
Wolff-Parkinson-White syndrome (WPW)
Worn or eroded teeth and tooth sensitivity
Worried about a loved one's drug or alcohol use
Wrist drop (radial nerve palsy)
Wrist injury after a fall
Wry neck (torticollis)

X

Xanthelasma (yellow patches on the eyelids)
Xanthomas (fatty bumps under the skin)
XX male syndrome and sex chromosome mosaicism
XYY syndrome (47,XYY)

Y

Yellow fever

Z

Zika virus
Zinc deficiency
Zollinger-Ellison syndrome

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