Fitness basics
Learning Center
Congenital myasthenic syndromes
These rare hereditary conditions result in a problem in nerve stimulation, causing muscle weakness that worsens with physical activity.
Atrial tachycardia
This type of fast heartbeat may occur after heart surgery or during pregnancy. But infections may trigger it, too. Learn how it's diagnosed and treated.
Encephalitis
Learn about this potentially fatal condition associated with inflammation of the brain and what you can do to prevent it.
Neuroblastoma
Learn more about the symptoms, diagnosis and treatment of neuroblastoma, one of the most common cancers of childhood.
Absence seizure
This type of seizure produces symptoms such as a vacant stare, lip smacking and eyelid fluttering.
Meningitis
Spot the signs and understand the treatment options for meningitis, an infection that has several possible causes.
Marfan syndrome
This inherited disorder affects the skeleton and the eyes. It can also harm the large blood vessel that carries blood from the heart to the rest of the body.
Erectile dysfunction
Understand what can cause the inability to get and keep an erection firm enough for sex and the possible treatment options.
Prader-Willi syndrome
Prader-Willi syndrome is a rare genetic disorder that results in physical, mental and behavioral problems, including a constant sense of hunger.
Delayed ejaculation
Learn what can cause delayed or absent ejaculation and how it can be treated.
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