A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs.

disease /dis·ease/ (dĭ-zēz´) any deviation from or interruption of the normal structure or function of any body part, organ, or system that is manifested by a ...

Infectious diseases, also known as transmissible diseases or communicable diseases comprise clinically evident illness (i.e., characteristic medical signs and/or ...

CDC Centers for Disease Control and Prevention - Your Online Source for Credible Health Information

Diseases and Conditions information from the Centers for Disease Control and Prevention.

Parkinson's disease is a disorder of the brain that leads to shaking (tremors) and difficulty with walking, movement, and coordination.

Lyme disease is transmitted by the bite of a tick infected with Borrelia burgdorferi. Get the facts on Lyme disease symptoms, treatment, diagnosis, stages, and ...

Different types of heart disease that affect the heart and steps that women can take to reduce the risk factors for heart disease.

Index of comprehensive articles on medical diseases and conditions. Covers all aspects of medicine produced by doctors.

Graves' disease — Comprehensive overview covers symptoms, causes, treatment of this thyroid disorder.