Fitness basics
Learning Center
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.
Retinoblastoma
Learn about the symptoms, causes and treatments for this eye cancer that occurs in young children.
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.
Reye's syndrome
Learn about the causes and treatment of this rare but serious condition causing swelling in the liver and brain.
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.
Ringworm (body)
Learn more on causes, symptoms, treatments of this easily spread fungal skin infection that itches and is related to athlete's foot.
Roseola
Learn about the causes of and home-care tips for this common viral infection that often affects children by age 2, causing a high fever followed by a rash.
Rotavirus
Learn more about this common childhood condition that causes fever, vomiting, diarrhea and sometimes abdominal pain.
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