Medications
Learning Center
Systemic mastocytosis
Excess mast cells can build up in skin, bone and organs. When triggered, the cells release substances that can cause allergic reactions and organ damage.
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.
Syphilis
Understand how this infectious disease spreads, what you can do to prevent it and how it's treated.
Swollen lymph nodes
Learn more about swollen lymph nodes, including possible causes and treatments your doctor may recommend.
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.
Swimmer's itch
Learn more about the symptoms, treatment and prevention of this itchy rash that usually affects people swimming in freshwater lakes.
Swimmer's ear
The moist environment from water remaining in your ear after swimming or bathing can lead to this infection in the outer ear canal.
Sweating and body odor
Learn more about the causes, treatment and self-care of this skin condition. Unusual changes may mean a medical problem.
Suspicious breast lumps
Most of these growths aren't cancer, but you should still get them checked promptly.
Supraventricular tachycardia
SVT is a heart rhythm disorder that causes a very fast or erratic heartbeat. The heart may beat more than 150 times a minute. Know the symptoms and when it's treated.
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