Hydatidosis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Hydatidosis?
A primary care doctor is often the first to evaluate symptoms and order imaging. Once a cyst is found, care usually involves a specialist, such as an infectious disease doctor or a surgeon, depending on where the cyst is and how it is treated.
What it is
Hydatidosis, also called echinococcosis or hydatid disease, is an infection caused by a tiny tapeworm parasite. People get it by swallowing tapeworm eggs passed in the stool of infected dogs. The eggs hatch and form fluid-filled sacs called cysts, most often in the liver or lungs, which can grow slowly over months or years.
Symptoms
Many people have no symptoms for years. When symptoms appear, they depend on the cyst's location and size. A liver cyst can cause pain in the upper right belly, nausea, or fullness. A lung cyst can cause a cough, chest pain, or shortness of breath. A ruptured cyst can cause a serious allergic reaction, so sudden severe illness with a known cyst needs immediate medical care.
Causes and who gets it
Hydatidosis is caused by swallowing eggs from the tapeworm Echinococcus granulosus, which lives in the intestines of dogs. People who live or work around dogs and livestock, such as farmers and herders, have the highest risk. The infection is rare in the United States but more common where dogs and sheep live closely together.
How doctors diagnose it
Doctors start by asking about symptoms and exposure to dogs or livestock. Imaging tests such as ultrasound, CT, or MRI can show the cysts, and blood tests can look for antibodies against the parasite.
Treatment
Treatment depends on the size and location of the cyst and whether it is causing problems. Small cysts without symptoms can simply be watched with regular imaging. Antiparasitic medicines, such as albendazole, may shrink cysts or keep them from growing. Larger or problematic cysts may need to be drained or removed with surgery.
When to see a doctor
See a doctor for ongoing belly pain, a cough that will not go away, or other symptoms that do not improve. Get help right away if a known cyst causes sudden fever, severe pain, or trouble breathing.
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 can order tests, watch small cysts over time, prescribe antiparasitic medicines, and refer to a specialist if a cyst needs draining or surgery.
Common questions
Can hydatidosis spread from person to person?
No. The infection does not pass directly between people. It only develops after a person swallows tapeworm eggs from an infected animal's stool or something the eggs have contaminated.
How common is hydatidosis in the United States?
It is rare in the United States. It is much more common in parts of the world where dogs, sheep, and other livestock live closely together.
Do hydatid cysts always need treatment?
Some small cysts stay the same size or become inactive over time. This is why doctors sometimes watch them instead of treating right away. Results differ from person to person, so regular imaging and follow-up are used to track what the cyst is doing.
How can I prevent hydatidosis?
Wash your hands after touching dogs or handling soil, and avoid feeding dogs raw meat or organs. In areas where the infection is common, wash raw vegetables well and avoid drinking untreated water.
Sources
- Centers for Disease Control and Prevention - CDC - DPDx - Echinococcosis
- MedlinePlus - Echinococcosis
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.
