A peak flow meter for asthma is like a thermometer for a fever - it helps you keep track of what's going on inside your lungs by measuring airflow out of the lungs.

There are two main types of breast pain. The most common type is linked to the menstrual cycle and is almost always hormonal.

Infectious mononucleosis causes swollen lymph glands, fever, sore throat, and chronic fatigue.

Families, spouses, or friends are often the first to suspect that their loved one is challenged by feelings, behaviors, or environmental conditions that cause them to act disruptive, rebellious, or sad.

BSE is a cattle disease, and vCJD is the equivalent disease in humans. Both are fatal brain diseases. Researchers believe that people become infected by eating beef contaminated with BSE.

Keeping extra weight off needs effort and commitment, just as losing weight does.

Depression is a serious mood disorder. It touches every part of your life and is caused by a chemical imbalance in your brain. Treatment involves medicine and counseling.

Malaria is caused by a parasite. It is passed to humans by the bite of an infected Anopheles mosquito.

Male infertility means that a man has a problem with his reproductive system. It means he can't start a pregnancy with a female partner. Read on to learn about causes, diagnosis, and treatment.

Detailed information on mammograms, including the different types, how a mammogram is done, and recommended screening guidelines.