Distomatosis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Distomatosis?
A primary care doctor, such as a family medicine or internal medicine doctor, often handles the first visit and testing. An infectious disease doctor or a gastroenterologist may help treat the infection, depending on the type of fluke and any organ damage.
What is distomatosis?
Distomatosis is an infection caused by parasitic flatworms called flukes, usually picked up from eating raw or undercooked freshwater plants, fish, or livestock meat where these parasites live.
Distomatosis is infection by trematodes, parasitic flatworms commonly known as flukes. Liver flukes live in the bile ducts, the tubes that carry digestive fluid from the liver to the intestine, while intestinal flukes live in the gut. The parasites can live in a person for years, sometimes without causing symptoms.
Symptoms
Symptoms depend on the type of fluke and how long the infection has lasted. Many people have mild or no symptoms at first. When they do appear, they often include stomach pain, diarrhea, tiredness, nausea, and unexplained weight loss.
Causes and who gets it
Distomatosis is caused by swallowing fluke larvae in contaminated food or water, most often raw or undercooked freshwater fish, crayfish, water plants such as watercress, or the meat of animals like sheep or cattle. People who live in or travel to rural areas where flukes are common have the highest risk.
How doctors diagnose it
Doctors usually diagnose distomatosis by checking stool samples under a microscope for fluke eggs, though several samples are sometimes needed because eggs are not always present. Blood tests and ultrasound can help show whether the liver or bile ducts are affected.
Treatment
Fluke infections are treated with prescription medicines that kill the parasites, most often praziquantel or triclabendazole, chosen based on the type of fluke. Treatment is usually very effective, and follow-up stool tests confirm the infection is gone.
When to see a doctor
See a doctor if you have ongoing stomach pain, diarrhea, or unexplained weight loss, especially after eating raw or undercooked freshwater fish, plants, or meat, or after travel to areas where flukes are common. Early testing and treatment can prevent long-term liver and bile duct damage.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor works similarly but usually costs more and often works alongside insurance. Either can order stool tests, blood work, and imaging, and prescribe the standard medicines for fluke infections. If the infection is causing bile duct blockage, liver damage, or a hard-to-identify parasite, they would refer the patient to a specialist.
Common questions
Can I spread distomatosis to my family?
No, the infection does not pass directly from person to person. The parasite needs time in a snail or animal host before it can infect someone new.
How can I lower my risk?
Avoid raw or undercooked freshwater fish, crayfish, and water plants such as watercress, especially in areas where flukes are common. Cook meat thoroughly. Wash hands and surfaces after handling raw fish or meat.
Is distomatosis dangerous?
Many people have mild symptoms, but long-term liver fluke infection can damage the bile ducts and has been linked to bile duct cancer. Early diagnosis and treatment lower the chance of problems.
Can it come back after treatment?
Medicines usually clear the infection, but a person can get infected again by eating contaminated food. Follow-up stool tests help confirm the parasites are gone.
Sources
- Centers for Disease Control and Prevention - About Fasciola | Liver Flukes
- NIH Genetic and Rare Diseases Information Center - Distomatosis | About the Disease | GARD
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
