Nutrition basics
Learning Center
Rickets
Learn what can cause this bone-softening disease in children and how supplements may prevent or treat the condition.
Rheumatic fever
Learn about this complication of strep throat and scarlet fever and what you can do to prevent it.
Rhabdomyosarcoma
This rare soft tissue cancer affects children more often than adults. Treatment may include surgery, chemotherapy and radiation therapy.
Reye's syndrome
Learn about the causes and treatment of this rare but serious condition causing swelling in the liver and brain.
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.
Retrograde ejaculation
Learn about the symptoms and treatment options for this condition that can cause male infertility.
Retractile testicle
Find out about this condition that allows the testicle to move between the scrotum and groin.
Retinoblastoma
Learn about the symptoms, causes and treatments for this eye cancer that occurs in young children.
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.
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.
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