Sex and aging
Learning Center
Heart valve disease
Learn about this condition in which one or more of the heart valves doesn't work properly.
Primary lateral sclerosis (PLS)
This motor neuron disease causes nerves within the brain to slowly break down. It causes muscle weakness primarily in the legs, arms and tongue.
Noonan syndrome
This genetic condition stops typical development in parts of the body. It may include unusual facial features, short height, heart problems or other issues.
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.
Congenital adrenal hyperplasia
This group of inherited genetic conditions limits the adrenal glands' ability to make certain vital hormones.
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.
Sunburn
Learn more about how UV rays harm your skin and what you can do for symptom sunburn relief and how to protect yourself from sun exposure.
Down syndrome
Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.
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