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Disease

Swimmer's ear

The moisture from water left in the ear after swimming or bathing can lead to this infection in the outer ear canal.
Disease

Swimmer's itch

Learn more about the symptoms, treatment and prevention of this itchy rash that usually affects people swimming in freshwater lakes.
Disease

Swollen knee

This condition can be caused by trauma, overuse injuries, or an underlying disease or condition. A fluid sample from the knee may be needed for diagnosis.
Disease

Swollen lymph nodes

Infection from bacteria or viruses most often causes this condition.
Disease

Synovial sarcoma

This rare type of cancer tends to occur near large joints, mainly the knee, in young adults. The main treatment is surgery.
Disease

Syphilis

Understand how this infectious disease spreads, what you can do to prevent it and how it's treated.
Disease

Syringomyelia

The development of a fluid-filled cyst in the spinal cord can eventually damage the cord and cause symptoms such as pain and muscle weakness.
Disease

Systemic mastocytosis

Too many mast cells can build up in skin, bone and organs. When triggered, the cells let out chemicals that can cause allergic reactions and organ damage.
Disease

Tay-Sachs disease

This rare, inherited disease causes a buildup of fatty acids that damages the brain and typically results in muscle control loss, blindness and paralysis.
Disease

Temporal lobe seizure

Learn about this burst of electrical activity that starts in the temporal lobes of the brain. This can cause symptoms such as odd feelings, fear and not responding to others.
Disease

Thoracic outlet syndrome

This group of conditions is caused by pressure on the blood vessels or nerves between the collarbone and rib. The pressure can cause pain and numbness.
Disease

Tonic-clonic (grand mal) seizure

Learn about this type of seizure that can cause convulsions. Also know how to help if you see someone having one.
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