Hemorrhoids are a common cause of.
The anus is the opening at the end of your anal canal. The rectum sits between your colon and anus and acts as a holding chamber for stool.
Most causes of a swollen anus are temporary and harmless, but some require medical attention. Depending on the cause of the swelling, people may have additional symptoms, such as pain, itching, burning, or bleeding around the anus. Damage to the lining of the anus or overstretching.