Overview
Acute porphyria attacks cause belly pain, vomiting, and sometimes weakness or confusion.
Skin porphyrias cause painful blisters in sunlight.
Symptoms
Common signs:
- Severe belly pain attacks
Less common
- Dark urine
- Blistering with sun
When to get medical care
Causes
Genes.
Does it spread or run in families?
- It isn't contagious. You can't catch it from someone else.
- It can run in families. Tell your doctor if a parent, brother, or sister has it.
Who is more likely to get it
- Family history
- Women: Attacks more common
- People who drink alcohol or smoke: More attacks
Possible complications
- Liver cancer: Higher risk with some types
Diagnosis
A clinician asks about your symptoms and may order tests.
The exam
A physical exam.
Tests
Tests, if needed:
- Urine and blood tests:
Treatment
Treatment depends on the cause and how severe it is.
Self-care
- Avoid triggers
Prevention
To lower your risk or prevent problems:
- Avoid triggers
Which doctor treats this
- Start with your primary care provider (family doctor or internist).
- They may send you to a hematologist (blood doctor).
Living with it
Support groups and helplines
- Genetic and Rare Diseases Information Center (GARD): Free NIH information on rare diseases, including where to find experts and patient groups.
- National Organization for Rare Disorders (NORD): Patient groups, help finding care, and aid programs for rare diseases.
Children, pregnancy, and older adults
- Women: Attacks can link to hormones.
Pregnancy and breastfeeding
- If you're pregnant or planning to be, tell your prenatal provider about this condition.
- Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
- Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
- Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.
Outlook
Treatment stops attacks.
Avoiding triggers prevents attacks.
Getting ready for your visit
Bring a list of your symptoms and medicines.
What to bring
- A list of your medicines and supplements
- Notes on when symptoms started and what makes them better or worse
Questions to ask
- What's causing this?
- What treatment do you recommend?
- Which medicines should I avoid?
Research studies
Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.
Sources
Last updated 2026-11-12.