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Rare Diseases

Also known as an orphan disease, a rare disease is an illness that typically affects less than 200,000 people in the U.S. and doesn't always get adequate research funding.

Editor's picks

Hemochromatosis, known as iron overload, is a medical condition that can be genetic or caused by too much iron from blood transfusions. The key symptoms are diabetes, bronzing of the skin, and cirrhosis (liver changes).
Acromegaly is disorder in the pituitary glands caused by a noncancerous tumor and results in the swelling or enlargement of the face, hands, and feet.
Guillain-Barre syndrome is a condition in which the body's immune system damages parts of neurons. Symptoms include progressive weakness, numbness or tingling, decreased reflexes, body aches, double vision, loss of balance, abnormal heart rhythms or blood pressure, and difficulty breathing.
Wolff-Parkinson-White (WPW) is a condition in which the heart beats abnormally fast due to electricity incorrectly traveling between pathways in the heart.
Congenital adrenal hyperplasia (CAH) is an inherited (genetic) disorder that causes the adrenal glands to make too much or too little of important hormones.
Friedreich's ataxia is a disease that causes progressive damage to the nervous system and affects nerve fibers leading from the spinal cord to the arms and legs.

Hemophilia B: Symptoms & Treatments

Hemophilia B is a hereditary bleeding disorder caused by a lack of blood clotting factor IX. People with hemophilia experience frequent bruising and prolonged bleeding.
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Acute Disseminated Encephalomyelitis

This article will review the symptoms, causes, and management of acute disseminated encephalomyelitis. Symptoms of the preceding illness include headache, fever, nausea, vomiting, or altered mental status, followed by the condition-specific symptoms of difficulty controlling limbs or eyes, trouble swallowing, speaking, or urinating, vision loss, spastic movements of the limbs, seizures, bleeding in the brain, as well as possible depression and psychosis.
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