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Disease

Pulmonary atresia with ventricular septal defect

This congenital heart defect affects the valve between the heart and lungs and includes a hole in the heart. Learn the symptoms and how it's treated.
Disease

Reactive arthritis

This joint pain is triggered by an infection in another part of the body — often the intestines, genitals or urinary tract.
Disease

Reactive attachment disorder

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.
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