Belly button pain can be caused by physiological factors, intestinal spasm, gastrointestinal dysfunction, intestinal bacterial infection and other factors. 1. Physiological factors: excessive force during defecation can lead to increased intra-abdominal pressure, abdominal muscle tension and other factors and the appearance of pain in the navel and other parts of the manifestations. 2. Intestinal spasm: due to eating cold food and other factors can lead to intestinal spasm, intestinal spasm can cause transient muscle spasm of the intestinal wall, the navel at the internal intestinal smooth muscle contraction is intense, there can be pain around the navel during bowel movements. 3. Gastrointestinal dysfunction: Gastrointestinal dysfunction can lead to intestinal flora reproduction, affecting the intestinal absorption function, intestinal mucosa can appear edema and other manifestations, which can induce the symptoms of pain in the navel after bowel movement. 4. Intestinal bacterial infection: chronic inflammation of the intestinal tract by bacterial infection, inflammation can stimulate the intestinal tract triggering intestinal dysfunction, constipation, diarrhea, pain in the navel during bowel movements and other symptoms. If you have pain in the navel during bowel movement, you need to consult a doctor in time, and under the guidance of a specialist doctor, you can actively carry out appropriate treatment, which can help to alleviate the uncomfortable symptoms as soon as possible.