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 swelling and irritation of your esophagus, set off by an infection.

When you think of allergic reactions, you likely picture itchy eyes and a runny nose. But an allergic reaction can happen in the esophagus--your food pipe--as well. Read on to learn more about eosinophilic esophagitis (EoE).

Achalasia is a disease that makes it hard to eat and drink normally. It affects your esophagus, which is the swallowing tube that connects the back of your throat to your stomach.

A look at the physical link between stress and heart health, along with tips to help keep your stress under control.

Hidradenitis suppurativa, or acne inversa, is a condition that causes deep, painful boils or abscesses in your skin.

Pneumoconiosis is a lung disease caused by breathing in certain kinds of dust particles that damage your lungs. It's often called a work-related lung disease.

After gastric bypass surgery for weight loss, the new connection between the stomach pouch and the small intestine may narrow. This is called an anastomotic stenosis. It’s also known as a stricture.

A necrotizing soft tissue infection causes patches of tissue to die. It is a very serious and life-threatening condition needing immediate medical care.