Fitness basics
Learning Center
Premature ejaculation
Understand what may cause ejaculation to happen earlier than wanted during sex. Also learn how to treat and prevent it.
Color blindness
Is it red or is it green? Learn more about what causes color blindness and how to tell whether or not you can distinguish between certain shades of color.
Itchy skin (pruritus)
Learn about causes of this common irritating skin condition and which treatments and self-care measures may provide relief.
Aortic valve disease
Learn more about diseases that affect the valve between the heart's main pumping chamber and the body's main artery.
Moyamoya disease
This rare disorder occurs when blood flow to the brain is blocked or narrowed and a tiny cluster of blood vessels forms at the base of the brain.
Vaginal agenesis
In this rare condition that occurs before birth, the vagina doesn't develop and the uterus may only develop partially or not at all. Learn about treatment.
Intracranial hematoma
This collection of blood within the skull is a serious, possibly life-threatening, complication of a head injury.
Hodgkin lymphoma (Hodgkin disease)
Learn how this cancer differs from other lymphomas. Find out about risk factors and treatments, such as chemotherapy, radiation and bone marrow transplant.
Urinary incontinence
Learn about possible causes of the loss of bladder control and what treatments are available for this problem.
Depersonalization-derealization disorder
This mental health condition causes you to feel like you're seeing yourself from outside your body or that things around you are not real, or both.
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