This common illness affects the lungs. It can seem like a cold, but may be severe, especially in children. Know the symptoms and treatment.
Disease
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.
Disease
Retinal detachment
Eye floaters and reduced vision can be symptoms of this condition. Find out about causes and treatment for this eye emergency.
Disease
Retinal diseases
Learn about the symptoms, diagnosis and treatment for various conditions that affect the retinas and vision. Find out when it's time to contact a doctor.
Disease
Retinoblastoma
Learn about the symptoms, causes and treatments for this eye cancer that occurs in young children.
Disease
Retractile testicle
Find out about this condition that allows the testicle to move between the scrotum and groin.
Disease
Retrograde ejaculation
Learn about the symptoms and treatment options for this condition that can cause male infertility.
Disease
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.
Disease
Reye's syndrome
Learn about the causes and treatment of this rare but serious condition causing swelling in the liver and brain.
Disease
Rhabdomyosarcoma
This rare soft tissue cancer affects children more often than adults. Treatment may include surgery, chemotherapy and radiation therapy.
Disease
Rheumatic fever
Learn about this complication of strep throat and scarlet fever and what you can do to prevent it.
Disease
Rheumatoid arthritis
This ongoing condition can affect more than just the joints. It also can damage skin, eyes, lungs, heart and blood vessels.