The Bernstein test (esophageal acid perfusion test) is used to see if you have gastroesophageal reflux disease (GERD).

A toxic megacolon is a rare yet life-threatening complication of severe colon disease or infection. It is diagnosed when your colon has expanded by more than 5 to 6 centimeters.

Metabolic dysfunction-associated steatotic liver disease (MASLD) means that you have fat deposits inside your liver. These deposits may keep your liver from doing a good job of removing toxins from your blood.

Smoking can harm your digestive system in many ways. It weakens the sphincter and allows stomach acid to flow backward into your esophagus.

Rectal prolapse is when part of the rectum bulges out of the anus. Read on to learn more, including cause, risk factors, symptoms, diagnosis, and treatment.

An anorectal abscess is a collection of pus under the skin in the area of the anus and rectum.

An anal fissure is a small, painful tear in the lining of the anus. Anal fissures may hurt and bleed during or after a bowel movement, but almost all heal without surgery.

An anal fistula is an abnormal opening in the skin near the anus. It leads to the inside of the anal canal in the colon.

Esophagitis is the irritation and inflammation of the lining of your esophagus, or food pipe. Because the lining of the esophagus is sensitive, many things can cause swelling and irritation.

Infectious esophagitis is inflammation and irritation of your esophagus caused by an infection. Read on to learn more.