The body appears roundworm infection is usually unclean food diet is contaminated by roundworm eggs, roundworms usually appear in the digestive tract, caused by the harm mainly includes two aspects: first, mainly affects the gastrointestinal tract, may cause enteritis, intestinal cramps, or even ascaris intestinal obstruction, serious cases require surgical treatment. Second, mainly biliary ascariasis, its typical clinical manifestations of severe pain under the raphe, also known as clinical symptoms and signs do not match, that is, the symptoms are very serious, but the local signs are not obvious, there is no obvious abdominal pressure, rebound pain or signs of peritonitis, usually ultrasound can be diagnosed, the treatment is generally used to deworming treatment.