Most children infected with roundworms have no symptoms. As the disease progresses, pulmonary symptoms, digestive symptoms, allergic reactions, neurological symptoms, systemic symptoms and malnutrition will appear. 1. Lung symptoms: persistent coughing, coughing up sputum, blood in sputum, chest pain, wheezing and so on. 2. Digestive symptoms: abdominal pain, diarrhea, bloody stools, vomiting, etc. Some may have roundworms in the vomit or feces. 3. Allergic reaction: the metabolites of roundworms can cause allergic reaction in some people, such as asthma and urticaria. 4. Neurological symptoms: children with severe infections may have neurological symptoms such as epilepsy and coma. 5. Systemic symptoms: fever, chills, malaise, and so on. 6. Malnutrition: there are often night terrors, teeth grinding, and some children have xerophagia, eating inedible things, such as dirt and belts. If the above symptoms occur, it is recommended to consult the doctor in time and standardize the treatment to reduce the adverse effects of the disease.