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Rectal prolapse
This rare condition happens when the rectum slips outside of the anus. Find out about symptoms and treatment.
Respiratory syncytial virus (RSV)
This common illness affects the lungs. It can seem like a cold, but may be severe, especially in children. Know the symptoms and treatment.
Restless legs syndrome
Uncomfortable sensations in your legs can interrupt your sleep — making you drag through your day. These therapies calm the restlessness and improve sleep.
Retractile testicle
Find out about this condition that allows the testicle to move between the scrotum and groin.
Retrograde ejaculation
Learn about the symptoms and treatment options for this condition that can cause male infertility.
Rett syndrome
This rare genetic disorder affects the way the brain develops, causing a progressive inability to use muscles for eye and body movements and language.
Reye's syndrome
Learn more about the causes and treatment of Reye's syndrome, a rare but serious condition causing swelling in the liver and brain.
Rhabdomyosarcoma
This rare soft tissue cancer affects children more often than adults. Treatment may include surgery, chemotherapy and radiation therapy.
Rheumatic fever
Learn about this complication of strep throat and scarlet fever and what you can do to prevent it.
Rickets
Learn what can cause this bone-softening disease in children and how supplements may prevent or treat the condition.
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