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A heart attack happens when the blood supply is cut off from the heart muscle, usually because of a blood clot. Without blood and oxygen, the muscle cells are damaged and die.

A psychiatric evaluation will look at symptoms and when they happen, as well as what impact they have on family and work relationships.

Seasonal affective disorder (SAD) is a type of depression. It happens during certain seasons of the year, most often fall or winter. Here's what you need to know.

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.

Amyotrophic lateral sclerosis (ALS) is a fatal type of motor neuron disease. Learn more about ALS, including causes, symptoms, and treatment.

When an area of the brain is damaged, which typically occurs with a stroke, an impairment may result. An impairment is the loss of normal function of part of the body. Sometimes, an impairment may result in a disability, or the inability to perform an activity in a normal way.

Guillain-Barré syndrome (GBS) is a rare neurological disorder in which the body's immune system attacks the peripheral nervous system.

A helpful guide to understanding stroke rehab programs.

Asthma is a chronic lung disease. The airways become sensitive to triggers (allergens and irritants). Here's what you need to know.