What is the most common problem that the belly button often hurts for several years?

Most of them are related to ascaris lumbricoides, but chronic enteritis, gastric ulcer and irritable bowel syndrome often cause periumbilical pain, which is manifested as hidden pain, diarrhea and untimely pain that persists for a long time. There are also: 1. Chronic enteritis: Chronic enteritis is mostly caused by incomplete treatment of acute enteritis, which can cause frequent periumbilical or lower abdominal pain, but the pain is not severe and there is no need for lower abdominal pain. Pain before and after defecation. Sometimes accompanied by loss of appetite, abdominal distension, fatigue and so on. 2. Gastric ulcer: The pain of gastric ulcer is more common in periumbilical and infrasternal pain, often accompanied by belching or acid regurgitation, repeated vomiting, loss of appetite, aggravated abdominal pain after eating, and sometimes hematemesis and bloody stool. Children's gastric ulcer is mainly related to children's partial eclipse, and the sense of hunger and satiety is uneven. Irritable bowel syndrome: Irritable bowel syndrome is a gastrointestinal motility disorder, also known as "allergic colitis". The main manifestation is recurrent abdominal pain, which can be located around the umbilicus or in the lower left abdomen. Constipation and diarrhea can appear alternately. Abdominal pain is aggravated before defecation, and relieved after defecation. The amount of defecation is small, often with mucus and colloid. This disease is often caused by mental factors and diet.