Belly pain on the left side of the navel, there are commonly the following reasons: first, abdominal muscle injury, often due to abdominal trauma or too strenuous activity caused by the appropriate more warm water, local massage or physical therapy, you can also use hot water bags for hot compresses, but also to increase rest, can help relieve the symptoms. Second, the abdominal cavity infection caused by the need to go to the hospital to check the blood routine, abdominal ultrasound, etc., to help clarify the diagnosis. Third, the abdominal wall with a long swelling, such as sebaceous cysts, intramuscular swelling, etc.. Fourth, the abdominal wall nerve factors caused by the need to check the nerve reflexes and other help to diagnose. Fifth, herpes zoster, in the early stage of the disease when no blisters appear, there can be pain in the abdominal wall, pinprick-like pain, with the extension of time, such as the emergence of herpes, can be clear. In short, if the abdominal pain persists, a prompt visit to the hospital is needed to clarify the cause.