Also see echinococcosis and hymenolepiasis. Trematodes, biliary duct-dwelling cause diseases including clonorchiasis and opisthorchiasis. Symptoms include upper abdominal pain, irregular high fever, lymphadenopathy, myalgia, and arthralgia. The condition may be chronic and include intermittent fever, vague abdominal symptoms, anorexia, and fatigue. Eosinophilia is pronounced.
Most infected persons have no significant symptoms.
If the parasite load is high, symptoms may include upper abdominal pain, feeling that something is moving in the liver, hepatomegaly with tenderness, jaundice, intermittent fever, lymphadenopathy, myalgia, and arthralgia. The condition may be chronic and include intermittent fever, vague abdominal symptoms, anorexia, and fatigue. Eosinophilia is pronounced. Infection ranges from light and asymptomatic to heavy and life-threatening. Initially there is malaise, nausea, cramping abdominal pain, and diarrhea.