Ascaris lumbricoides is a common intestinal parasite, and ascariasis in children is a disease caused by adult roundworms parasitizing in the human small intestine. The symptoms caused by adult roundworm are mainly manifested in the following three aspects: 1, gastrointestinal dysfunction, when the human body is infected with a small number of worms, clinical symptoms are not obvious, or only a slight indigestion, loss of appetite, anorexia and easy hunger and other symptoms. Sudden paroxysmal pain around the navel often occurs, no pressure pain, no abdominal muscle resistance, usually able to relieve themselves, clinical often have constipation, diarrhea symptoms, and serious intestinal obstruction. The children often have mental restlessness, irritability, night terrors, teeth clenching, itching and convulsions, etc. A few severe cases have mental retardation and developmental disorders. 3. Allergic reactions, such as urticaria, asthma or fever and other allergic phenomena, can also be manifested as intestinal cramps, skin itching, occasionally intractable urticaria, angioneurotic edema.