Children with worms in the stomach may be ascariasis, pinworm disease, hookworm disease, etc. Ascariasis usually manifests as abdominal pain, malnutrition, etc.; pinworm disease manifests as perineal and perianal itching, loss of appetite, etc.; hookworm disease may manifest as black stools, gastrointestinal dysfunction, etc. 1. Ascariasis: Ascariasis can present with irregular paroxysmal abdominal pain around the umbilicus, xerophagia, teeth grinding, etc. Paroxysmal colic in the right epigastric region can occur when complicated by biliary tract infection. Children can also be accompanied by loss of appetite, nausea and vomiting, diarrhea, malnutrition and other manifestations. 2. Pinworm disease: pinworm disease can be manifested as perineal or perianal itching at night, crying or sleep disturbance, accompanied by unexplained loss of appetite, nausea and vomiting, diarrhea and other symptoms. 3. Hookworm disease: Hookworm disease can appear black stool symptoms, some children will also be accompanied by small-cell hypochromic anemia, malnutrition and gastrointestinal disorders and other gastrointestinal symptoms. If children have the above symptoms, parents are advised to take their children to the hospital in time, under the guidance of the doctor for treatment.