There are several reasons for the appearance of internal anal hidden pain: 1, patients with anal fissure cause anal tearing during defecation, as a result of which pain occurs.2, if prolapse of hemorrhoids occurs, edema or thrombus may occur to cause local obstruction, and the patient may experience severe pain.3, some patients with perianal abscess may experience severe anal pain.4, in addition to the disease, it is often a transient anal muscle spasm caused by, this pain may sometimes bring a great psychological barrier to the patient, may be anal pain. As the part of the anus is healthy, and the patient’s daily diet and living habits have a close relationship between, so usually must develop good eating habits. If the condition of pain in the anus is more serious, go to the hospital for examination in time.