Opinions and suggestions: Blood-sucking parasites enter the human body through the skin and parasitize in the venous system. Acute blood-sucking parasites often cause rash, fever, cough, chest pain, abdominal pain, diarrhea, and hepatosplenomegaly for the first time. , there are also jaundice and kidney damage, usually no more than 6 months. Chronic schistosomiasis often develops into chronic disease without treatment in the acute phase, and may be asymptomatic or present with abdominal pain, diarrhea, and hepatosplenomegaly. Chronic blood-sucking liver disease damages the liver, causing hepatomegaly and fibrosis. In the late stage, it can develop into cirrhosis, portal vein high elbow to splenomegaly, esophageal variceal bleeding and other serious diseases.