What causes anus pain after bowel emptying?

Get evaluated: Both gastroenterologists & colorectal surgeons can help you. They will first perform a visual inspection & digital exam after taking your history as to circumstances, duration, quality, timing of symptoms & your risk factors. They may then determine topical treatment or ask to perform further evaluation of the rectal lining. Symptoms may prove functional (proctalgia fugax) & warrant different rx.

Anal or rectal?: If anal, have you simply split the anys slightly? Fissures can be quite painful. There are other causes too. Dr. Cattano's answer is also good.