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Living with Anisakiasis

An infection from roundworms in fish that people eat, which can cause nausea and vomiting or stomach and bowel problems.

Understanding Anisakiasis

Anisakiasis is an infection with roundworms of the genus Anisakis.

People get it by eating fish that carry roundworm larvae. The worms may cause sudden nausea and vomiting, or they may burrow into the wall of the digestive tract and form lumps (eosinophilic granulomas) in the stomach, intestines, or omentum. It can affect people of a variety of ages.

Signs & symptoms

Symptoms vary from person to person. GARD's summary says they may include:

  • Sudden nausea
  • Vomiting
  • Lumps in the stomach, intestines, or omentum

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What fish did I eat that may have exposed me?
Which tests confirm this infection?
How can I lower my chance of getting it again?

Quick facts

Symptoms usually starta variety of ages

GARD says people get it by eating fish that carry roundworm larvae.

Infectious

Also known as: anisakis simplex infection; infection by anisakis larva; infection caused by anisakis larva

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · AnisakiasisGARD ID 693 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Anisakiasis.

Explore the Anisakiasis blog

Explore research for Anisakiasis

Explore actively recruiting Anisakiasis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Anisakiasis with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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I can help you find recruiting Anisakiasis studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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