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Leukemia is cancer that starts in the bone marrow, which is where new blood cells are made. The bone marrow is a thick, sponge-like tissue in the center of certain bones. Read on to learn more.

Adrenal cancer is a rare cancer that begins in the adrenal glands. Read on to learn more about the adrenal glands, and types of tumors found there.

Detailed information on allergic reactions to insect bites and stings.

Idiopathic environmental intolerance (IEI) is a set of symptoms caused by contact with some kinds of substances. Read on to learn more about causes, symptoms, triggers, and treatment.

Most allergic reactions are a result of an immune system that responds to a "false alarm."

Cancer starts when cells in the body change (mutate) and grow out of control. To help understand what happens when you have cancer, it helps to look at how your body normally works.

Some babies have a more difficult trip through the birth canal than others, resulting in physical injuries. These injuries usually are not serious and clear up or improve within a few days or weeks after the birth.

Bladder or bowel incontinence means a problem with holding in urine or stool. Here's what you should know.

A brain tumor is an abnormal growth of tissue in the brain.