Aerobic exercise
Learning Center
Premature ventricular contractions (PVCs)
Premature ventricular contractions (PVCs) are extra heartbeats that disrupt the heart rhythm. PVCs are common.
Premenstrual syndrome (PMS)
Mood swings, cramps and irritability are just a few telltale clues that you're getting your period. Learn what you can do for PMS symptom relief.
Proctitis
Proctitis means inflammation of the rectal lining. This condition is often a treatment side effect or part of a more generalized disease.
Pulmonary valve stenosis
When the valve between the heart and lungs is narrowed, blood flow slows. Know the symptoms of this type of valve disease and how it's treated.
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.
Rubella
Learn more about the symptoms and prevention of this contagious viral infection best known for its distinctive red rash.
Sex headaches
Learn about the causes and treatment of this type of headache.
Sinus headaches
Sinus headaches are often to blame for headache with facial pain — but that pain might actually be a migraine.
Stomach polyps
These masses of cells that form on your stomach lining usually don't cause symptoms. Learn what causes them and when to be concerned.
Stye (sty)
A stye (sty) is a painful red bump along the eyelash line that can often be treated with home remedies. Find out more about this irritating eyelid infection.
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