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The signs of pregnancy vary from woman to woman, but the most obvious sign usually is a missed period.

Don't smoke during your pregnancy and limit how much time you spend in environments where there is secondhand smoke.

Certain tests and screenings may be scheduled during your pregnancy. Your healthcare provider will advise you on which tests you'll need.

Emphysema is a chronic lung condition in which the air sacs (alveoli) may be destroyed, narrowed, collapsed, stretched, or overinflated. Pulmonary emphysema is part of a group of lung diseases called COPD. Here's what you need to know.

Depression is a whole-body illness. It involves the body, mood, and thoughts. Depression affects the way you eat and sleep. It also can affect the way you feel about yourself and things. It is not the same as being unhappy or in a "blue" mood. It is not a sign of personal weakness or a condition that can be willed or wished away. When you have depression, you can't "pull yourself together" and get better. Treatment is often needed and many times crucial to recovery.

Detailed information on actinic keratosis, including causes and treatment.

A look at what we know about how migraine pain starts.

The nervous system is a complex, sophisticated system that regulates and coordinates the body's basic functions and activities. It is made up of two major divisions: the central nervous system and the peripheral nervous system.

Meningitis is inflammation of the membranes that surround the brain. Meningitis can be caused by either a virus or bacteria. Bacterial meningitis may be life-threatening.