Stuttering, sometimes called stammering, is a speech condition that involves problems with rhythm and flow when speaking.
Disease
Stye (sty)
This is a painful bump along the eyelash line that can often be treated with home remedies. Find out more about this irritating eyelid infection.
Disease
Subarachnoid hemorrhage
Learn about how this type of bleeding in the brain is diagnosed and treated.
Disease
Subconjunctival hemorrhage (broken blood vessel in eye)
Learn about this common eye condition that may look alarming but is usually harmless and clears up without treatment.
Disease
Sudden cardiac arrest
This medical emergency involves sudden loss of all heart activity. Learn how fast, appropriate care may help prevent death.
Disease
Sudden infant death syndrome (SIDS)
Learn about the unexplained death of a young baby who seems healthy.
Disease
Suicide and suicidal thoughts
Suicide can be prevented. Learn suicide warning signs and how to reach out for immediate help and professional treatment.
Disease
Sun allergy
Learn more about the causes, symptoms and treatment of this itchy rash that is an allergic reaction to sunlight.
Disease
Sunburn
Learn more about how UV rays harm your skin and what you can do for symptom sunburn relief and how to protect yourself from sun exposure.
Disease
Supraventricular tachycardia
SVT is a heart rhythm condition that causes a very fast or erratic heartbeat. The heart may beat more than 150 times a minute. Know the symptoms and how it's treated.
Disease
Suspicious breast lumps
Most of these growths aren't cancer, but you should still get them checked promptly.
Disease
Sweating and body odor
Learn more about the causes, treatment and self-care of these natural and common skin conditions. Unusual changes may mean a health problem.