Reactive attachment disorder is when an infant or young child doesn't establish healthy attachments with parents or caregivers due to neglect.
Disease
Renal artery stenosis
Learn about what happens when the arteries leading to the kidneys narrow, as well as treatments for this condition.
Disease
Rheumatoid arthritis
This ongoing condition can affect more than just the joints. It also can damage skin, eyes, lungs, heart and blood vessels.
Disease
Seasonal affective disorder (SAD)
This type of depression is related to changes in seasons and begins and ends at about the same times every year.
Disease
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.
Disease
Septic arthritis
Learn about this painful infection in a joint and why quick treatment can help lessen joint damage.
Disease
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal respiratory illness. The last known infection was reported in 2004.
Disease
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.
Disease
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.
Disease
Sleep apnea
This condition causes repeated stops and starts in breathing during sleep. Snoring loudly can be a sign of this sleep condition.
Disease
Social anxiety disorder (social phobia)
Learn more on this disorder where everyday interactions cause significant worry and self-consciousness because you fear being judged negatively by others.
Disease
Spinal arteriovenous malformation (AVM)
Learn about how this rare blood vessel condition can affect the spinal cord.