If children have roundworms in their stomach, they will have frequent abdominal pain, discharge of roundworms in stool, vomiting, headache and other symptoms, as follows: 1. frequent abdominal pain, with roundworms in the stomach, the roundworms will travel in the intestine, which will cause widespread abdominal pain, and the abdominal pain is repeated and relatively long-lasting; 2. there are symptoms of discharge of roundworms in stool, some roundworms will be discharged through the stool, which can be observed by the naked eye; 3 There is vomiting and even headache. If the roundworm is more serious and migrates to the brain of children, it will also cause headache and vomiting symptoms, and the diagnosis should be confirmed by cranial MRI in time.