Normally, parasites are not present in the human body. However, it is possible to be infected with parasites under conditions such as lack of hygiene, unclean eating habits and poor lifestyle. Common internal parasites include roundworms, pinworms, liver fluke, hookworms, pork tapeworms, etc. The main routes of infection include the fecal-oral route, vectorial insect infections, and contact infections, such as accidental ingestion of eggs attached to food, and eating fish and shrimp in raw or semi-raw form. Depending on the type of parasite infected, different symptoms such as abdominal pain, paranoia, anorexia, polyphagia, lethargy and weight loss may occur. If you have these symptoms or suspect that you are infected with parasites, you may undergo a pathogenetic examination to determine whether you are infected with parasites by looking for worms in body fluids or secretions, or you may be able to determine whether you are infected with parasites through routine blood tests and blood antibody tests. For those who are suspected to be infected with parasites or have other discomforts, it is recommended to consult a doctor for standardized diagnosis and treatment in a timely manner.