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. When pressure in your rectum becomes too great, the internal ring of muscle called the anal sphincter relaxes to allow stool to pass through your anal canal, the anus, and out of your body. The anus consists of glands, ducts, blood vessels, mucus, tissues, and nerve endings that can be highly sensitive to pain, irritation, and other sensations.
Hemorrhoids are swollen veins in the anal canal. This common problem can be painful, but it's usually not serious. Veins can swell inside the anal canal to form internal hemorrhoids. Or they can swell near the opening of the anus to form external hemorrhoids. You can have both types at the same time. The symptoms and treatment depend on which type you have.
Anal swelling can occur for a variety of reasons. Most causes of a swollen anus are temporary and harmless, but some require medical attention. The anus is at the end of the rectum, and muscle surrounds it.
Rectal prolapse is a medical condition in which the rectum starts to push through the anus. The rectum is that last part of your large intestine, and the anus is the opening through which stool exits your body. Rectal prolapse affects about 2. Women over 50 are six times more likely than men to have this condition.
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