The pain in the stomach and anus together is caused by anal diseases, and the pain in the stomach is mostly due to the symptoms of anal diseases extending to the abdomen, as follows: 1. If the perianal abscess is high, pain in the anal area and abdominal pain can occur at the same time. 2. When the cancer grows to a certain extent and invades the soft tissues around the rectum, anal pain can occur. 3. Hemorrhoids can also cause anal and stomach pain together, anal fissures, perianal abscesses, inflammatory external hemorrhoids, and thrombosed external hemorrhoids often lead to persistent anal pain. 4. If the fissure produces severe pain when defecating, it can also cause pain in the abdomen. acute anal fissure conservative treatment, chronic anal fissure surgical treatment, anal pain Be sure to exclude the possibility of the presence of perianal abscess.