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.

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

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.

Peritonitis is a redness and swelling (inflammation) of the tissue that lines your belly or abdomen. This tissue is called the peritoneum.

Learn about tests that may be used to help diagnose a stroke, including a CT scan, an MRI scan, and an EEG.

These procedures are often used in the evaluation and treatment of cardiovascular disease.

Acoustic neuroma is a rare noncancer tumor. It affects hearing and balance when the tumor presses on the nerves in the inner ear.

Poorly controlled diabetes can lead to gum disease, which is an infection of the gums and bone that hold the teeth in place.

Heart failure is a condition in which the heart can't pump enough blood to meet the body's needs.

Tendonitis is when a tendon is inflamed. When a tendon is inflamed, it can cause swelling, pain, and discomfort. Another problem called tenosynovitis is linked to tendonitis. This is the inflammation of the lining of the tendon sheath around a tendon.