If a child eats a foreign body, there will often be abdominal pain, blood in the stool, nausea and vomiting, as follows: 1. abdominal pain: if the foreign body is very sharp, it will often cut the child’s digestive tract, thus causing abdominal pain; 2. blood in the stool: if the foreign body is relatively sharp and causes damage to the digestive tract, it will not only cause abdominal pain, but also bleeding in the stool; 3. nausea and vomiting: if the foreign body is relatively If the foreign body is relatively hard or smells bad, it will often stimulate the gastrointestinal tract, thus causing vomiting and nausea. For foreign bodies in children, gastroscopy and colonoscopy can be performed to remove them.