Clear answers about your health.

Ask a health question or look up a condition, symptom, medicine, or test. We search trusted U.S. government health sources like MedlinePlus, the CDC, the NIH, and the FDA, and give you plain-language answers.

Check your symptoms

Describe what you're feeling and see conditions that can cause it, and how soon to get care.

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Conditions A–Z

Browse every condition by its first letter.

Common conditions

Common coldA mild viral infection of the nose and throat.Influenza (flu)A viral infection that tends to come on suddenly, with fever, body aches, and tiredness.COVID-19A viral infection that can cause fever, cough, tiredness, and loss of taste or smell.Strep throatA bacterial throat infection.MigraineA headache that often throbs on one side and may come with nausea or light sensitivity.High blood pressure (hypertension)Blood pressure that stays higher than normal.Diabetes (high blood sugar)A long-term condition where blood sugar stays too high.AnxietyOngoing worry or nervousness that is hard to control and affects daily life.DepressionA persistent low mood or loss of interest that lasts at least 2 weeks.Urinary tract infection (UTI)A bacterial infection of the bladder that causes burning and a frequent urge to urinate.Head liceTiny insects that live on the scalp and lay eggs (nits) on hair shafts.AsthmaThe airways tighten and swell, causing wheezing, coughing (often at night or with exercise), and a tight…

In an emergency, call 911.Thinking about suicide? Call or text 988.Possible poisoning? Call Poison Control at 1-800-222-1222.

Plain language

Written in everyday words, so anyone can understand it.

Sources you can check

Every page links to its sources, like MedlinePlus, the CDC, and the NIH.

Know when to get care

Every condition shows when to call 911, get care today, or see a doctor soon.