Clonorchiasis is an infection caused by a parasitic flatworm known as Clonorchis sinensis, commonly referred to as the Chinese liver fluke. People typically become infected by eating raw or undercooked freshwater fish that contain the larvae of this parasite. Once inside the body, the fluke migrates to the liver, where it can cause various health issues, including inflammation and bile duct obstruction. Symptoms of clonorchiasis may include abdominal pain, nausea, and jaundice, but some people may not show any signs at all. If left untreated, the infection can lead to more severe complications, such as cholangiocarcinoma, a type of bile duct cancer. Proper cooking of fish and good hygiene practices can help prevent this infection.