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Lupus is an autoimmune disorder that can range from mild to severe. It affects more than 1 million Americans, most of whom are women. Find out more about this autoimmune disease by taking the following quiz.

To keep your memory sharp, it's helpful to understand factors that affect memory for better or for worse.

Meningitis is an infection of the membranes that surround the brain and spinal cord. Both viruses and bacteria cause meningitis. Bacterial meningitis can be life-threatening; viral meningitis seldom is. Learn more about bacterial meningitis through this quiz.

Answer this one: A woman is considered to have begun menopause after she has missed how many menstrual cycles?

Computed tomography is an imaging test that uses X-rays and a computer to make detailed images of the body. A CT scan shows details of the bones, muscles, fat, and organs.

A nerve conduction velocity test measures how fast electrical impulses move through your nerves. The test is used to identify nerve damage.

Evoked potentials studies measure electrical activity in the brain in response to stimulation of sight, sound, or touch.

Fluoroscopy is a type of imaging tool. It looks at moving body structures. It’s much like an X-ray "movie."

An electrocardiogram (ECG) is one of the simplest and fastest tests used to evaluate the heart. Electrodes (small, plastic patches that stick to the skin) are placed at certain locations on the chest, arms, and legs. When the electrodes are connected to an ECG machine by lead wires, the electrical activity of the heart is measured, interpreted, and printed out.