Patients infected with parasitic disease by eating raw fish may experience gastrointestinal discomfort, fever, headache, abdominal pain, weakness of limbs, pain in the liver area and other symptoms. There is a risk of parasitic infection after consuming raw fish. Generally, parasites such as Chinese testicular trematode and heterotrichous nematode can be found in the body of fish, and the clinical symptoms of infection with different types of parasites are different. 1. Chinese branchiostoma: In case of heavy infection, in the acute stage, it mostly shows allergic reaction, intestinal discomfort and other symptoms, such as fever, abdominal pain, loss of appetite, weakness of limbs, pain in the liver area, and a significant increase in eosinophils. Children and adolescents infected with these parasites have more serious symptoms and higher mortality. 2. Heterotrichous nematodes: Mild cases often manifest gastrointestinal discomfort, while severe cases may manifest severe pain in the upper abdomen with nausea and vomiting a few hours after eating raw fish, or lower abdominal pain, abdominal distension, diarrhea and other symptoms a few days later. If the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.