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Learning Center
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.
Shellfish allergy
It's possible to be allergic to some types of shellfish without reacting to other types. Learn more about this common food allergy.
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Separation anxiety disorder
This is intense or prolonged separation anxiety that interferes with school or other daily activities or includes panic attacks. Learn about treatment.
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.
Scorpion sting
Scorpion stings are painful but rarely life-threatening. Young children and older adults are most at risk of serious complications.
Scarlet fever
Learn more about the symptoms, causes, complications and treatment of this strep bacterial infection that causes a red rash, sore throat and high fever.
Sarcoma
Learn about this cancer that forms in the bones and the connective tissue. Find out about symptoms, diagnosis, treatment and the many types of sarcoma.
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