Anal pain is mainly a symptom of pain in and around the anorectum that is common to many anorectal diseases. Because of the rich vascular nerves in the anal tissue, it is more sensitive to the stimulation of trauma and inflammation, and even a very small injury and very limited inflammation can cause severe or even intense pain and discomfort. 1, hemorrhoid disease (1) inflammatory external hemorrhoids: mainly seen in the external hemorrhoids inflammation edema, more triggers, the most common is cold, exertion, going out, drinking alcohol, etc.. The painful swelling and discomfort that you feel as if the anus is coming out. (2) Internal hemorrhoid impaction: the main cause is painful swelling and burning pain, mostly due to the formation of varicose veins, broken blood circulation and thrombosis of hemorrhoids, resulting in restricted tissue circulation and prolapse outside the anus, which cannot be retracted. (3) Thrombosed external hemorrhoids: This is due to the increase in abdominal pressure caused by the force of defecation, coughing and gargling, which causes the small subcutaneous veins around the anus to rupture, resulting in subcutaneous bleeding and the formation of a blood tether, causing pain and discomfort. The larger the tether, the more painful it is. The appearance of a purple skin bulge is visible. 2, old anal fissure: due to long-term repeated fissures, local repeated inflammation and hyperplasia, the formation of a fallen creature similar to external hemorrhoids, the most common in the posterior position. It is also called “sentinel hemorrhoid” because it is located at the outermost part of the anus. Sometimes it is also inflamed and edematous like external hemorrhoids, which then causes pain. 3.Perianal abscess. 4, rectal cancer: no pain in the early stage, later, due to the enlargement of the mass and breakage, there can be anal swelling, hidden pain, common stool habit change, pus and blood stool, abdominal distension, abdominal pain, weight loss and other symptoms. 5.Anal foreign body: the injury is mostly caused by traumatic foreign body residue or improper diet, fish spur, bone fragments embedded in the rectum of the anal canal, so you need to ask the doctor to carefully examine and remove the foreign body, the pain can be relieved. If the retention time is too long, it can cause local infection. 6, anal sinusitis: generally for the anal part of the slight pain, swelling, defecation due to fecal pressure on the inflamed anal sinus and cause burning pain in the anal part, if the sphincter muscle contracture due to stimulation, the pain is increased, and radiates to the buttocks and the rear of the femur. The pain is often accompanied by a small amount of purulent or mucus discharge, which smells bad and can cause perianal dampness and itching over time. The main manifestation is painful swelling.