Consumer health basics
Learning Center
Spina bifida
Learn about this condition in which an unborn baby's spine and spinal cord don't form properly. Surgery during pregnancy may be a treatment option.
Spider bites
Learn more about prevention, symptoms, complications and treatment of spider bites, which are usually harmless.
Spermatocele
Learn more about this noncancerous testicular disorder that may require surgery if it's causing discomfort. But, the condition often needs no treatment.
Sickle cell anemia
Learn about the symptoms, causes and treatment of this inherited blood disorder that, in the United States, is more common among Black people.
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or irregular heartbeats. Learn the symptoms and how it's treated.
Shigella infection
Shigella infection is an intestinal infection that causes diarrhea. Learn how to recognize, treat and prevent the spread of this contagious condition.
Shaken baby syndrome
Understand why shaking a baby can cause brain damage, and why getting immediate medical care can save a child’s life or prevent serious health problems.
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Seizures
Learn about the different types of seizures and what causes them. Also find out what to do if you see someone having a seizure.
Scrotal masses
Lumps in the scrotum have various causes. Even painless lumps should be checked promptly by a health care professional.
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