Intestinal parasites mainly include protozoa and helminths, including roundworms, pinworms, hookworms, whipworms, tapeworms, amoebas and so on. Different parasites can cause different symptoms, for example, roundworms mainly cause vague pain and discomfort around the umbilicus, children may develop xenophagia, and in severe cases, biliary ascariasis. Pinworms mainly cause severe itching around the anus, especially at night. Hookworms mainly cause chronic anemia, and amoebas mainly cause abdominal pain, diarrhea, and mucopurulent stools. Since intestinal parasites are mainly infected by eating contaminated food or water, the most important measure to prevent intestinal parasites is to wash hands regularly before and after meals and pay attention to the cleanliness of the environment.