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The heart is a pump made of muscle tissue. Its pumping action is controlled by electrical impulses.

Barrett esophagus occurs when the normal cells that line your food pipe (esophagus) turn into cells not usually found in your body. The new cells take over because the lining of the esophagus has been damaged. The new, abnormal cells are called specialized columnar cells or intestinal metaplasia.

Diarrhea is when your stools are loose and watery. Read on to learn more about causes and treatments.

Diverticular disease is an infection in the tiny pouches that some people get in their colon. The pouches are called diverticula. These pouches bulge out through weak spots in your colon. The pouches can become inflamed (red, swollen) or infected.

Gastroparesis is a disorder involving your stomach muscles. Learn more about this condition, including cause, risk factors, symptoms, diagnosis, and treatment.

Helicobacter pylori (H. pylori) is a type of bacteria that infects your stomach. Learn more about this infection, including cause, risk factors, symptoms, diagnosis, and treatment.

Hemorrhoids are swollen and irritated veins or blood vessels in and around your anus and lower rectum. This happens when there is extra pressure on these veins.

Hepatitis A is a liver disease that is easily spread from person to person. Hepatitis is a inflammation of the liver that sometimes causes lasting damage. Hepatitis A is a cause of hepatitis.

GERD (gastroesophageal reflux disease) is a digestive disorder. It is caused when gastric acid from your stomach flows back up into your esophagus.