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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.

Constipation is not being able to have bowel movements often enough. It can cause pain and other symptoms. Learn more about the causes, tests, and treatments for this common GI (gastrointestinal) problem.

Pericarditis is inflammation of the pericardium, the thin sac that surrounds the heart. Read on to learn details, such as causes, symptoms, diagnosis, treatment, and complications.

Arthritis is a category of rheumatic diseases. Read on to learn more about these conditions and the types of health care providers who treat them.

Ankylosing spondylitis (AS) is a type of arthritis that affects the spine. Read on to learn details about this condition, including symptoms, diagnosis, and treatment.

Your body has 2 adrenal glands. They are found on top of each kidney. The adrenal glands make certain types of hormones. If they make too much of (overproduce) these hormones, they are called overactive.

Detailed information on avoidance of allergens and treatment for allergy, including immunotherapy (allergy shots) and medicine.

Learn about asthma flare-ups in your child, including symptoms to recognize.

Detailed information on dust mite allergens.