Fitness basics
Learning Center
Enlarged spleen (splenomegaly)
Learn about what your spleen does and what can happen if it becomes enlarged.
Obsessive-compulsive disorder (OCD)
OCD features unwanted thoughts and fears, or obsessions. These obsessions lead to repetitive behaviors, also known as compulsions, that get in the way of daily activities.
Wolff-Parkinson-White (WPW) syndrome
This heart condition present at birth causes a fast heartbeat. Rarely, it can cause sudden cardiac death. Know the symptoms and how it's treated.
Itchy skin (pruritus)
Learn about causes of this common irritating skin condition and which treatments and self-care measures may provide relief.
Swimmer's itch
Learn more about the symptoms, treatment and prevention of this itchy rash that usually affects people swimming in freshwater lakes.
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.
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
Post-traumatic stress disorder (PTSD)
This mental health condition, which is caused by being part of or witnessing a terrifying event, leads to symptoms that include flashbacks, nightmares and severe anxiety.
Down syndrome
Down syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.
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.
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