Fascioliasis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Fascioliasis?
A primary care doctor is usually the first doctor a person sees and can order tests and prescribe medicine. Some cases are referred to an infectious disease doctor or, if the bile ducts are blocked, a gastroenterologist. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Fascioliasis is an infection caused by a parasitic worm called a liver fluke. It settles in the bile ducts, the tubes that carry bile from the liver to the intestine. People usually get it by eating water plants, most often watercress, that grew where infected animals lived.
Symptoms
Many people feel fine for a long time, and some never feel sick. When symptoms appear, they often start with stomach pain, fever, tiredness, and weight loss. Later, pain may move to the upper right side of the belly, and the skin or eyes can turn yellow, called jaundice.
Causes and who gets it
The infection comes from swallowing the young form of the fluke, usually on raw water plants like watercress or in water from streams or ponds. Sheep and cattle carry the parasite most often, so it is found mostly where those animals graze near fresh water in parts of South America, Africa, Asia, and Europe.
How doctors diagnose it
Doctors start by asking about symptoms, diet, and travel. A common test checks a stool sample for the parasite's eggs. Blood tests can show antibodies, and imaging like ultrasound or CT can show damage in the liver or worms in the bile ducts.
Treatment
Fascioliasis is treated with prescription medicine that kills the fluke, most often triclabendazole, taken by mouth. A doctor decides whether treatment is needed and may check stool samples afterward to confirm the infection is gone.
When to see a doctor
Anyone with ongoing stomach pain, fever, unexplained weight loss, or yellowing of the skin or eyes should see a doctor, especially after eating raw watercress or drinking untreated stream water.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either kind can order tests, prescribe medicine, and follow up, referring complicated cases to a specialist.
Common questions
Can I get fascioliasis from another person?
No. The parasite must pass through a snail and then an animal such as a sheep or cow before it can infect a person. Someone with fascioliasis cannot pass it directly to family members.
Is it safe to eat watercress?
Commercially grown watercress from regulated farms is generally safe. The risk comes from wild water plants gathered from streams or ponds where infected animals graze. Washing does not always remove the parasite. Avoiding wild watercress is the safer choice.
How soon do symptoms appear after infection?
Early symptoms can start within weeks, but many people do not feel sick for months. The worms take time to mature and settle in the bile ducts. This delay can make the infection hard to connect to something a person ate long ago.
Does the infection go away on its own?
Some people clear the infection without knowing they had it. Others stay infected for years if untreated. Long-term infection can damage the liver and bile ducts. Anyone who suspects the infection should see a doctor rather than wait it out.
Sources
- Centers for Disease Control and Prevention - CDC - DPDx - Fascioliasis
- MedlinePlus - Triclabendazole: MedlinePlus Drug Information
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.
