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Anemia
Anemia is the most common blood disorder in the U.S. It affects your red blood cells and hemoglobin. Most people…
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Angina
Angina is a heart condition that causes chest pain or pressure.
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Ankle Sprains
Ankle sprains range from mild to severe and need immediate treatment.
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Appendicitis
Appendicitis is an inflammation or infection in your appendix. It can cause pain and swelling, and the appendix may burst…
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Arrhythmia
An arrhythmia is a change in the rhythm of your heartbeat. Your heart may beat too fast, too slow, or…
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Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)
Arrhythmogenic right ventricular cardiomyopathy is an uncommon genetic heart problem that causes muscle cells in your ventricle wall to…
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Asperger's Syndrome
Asperger’s syndrome is a developmental disorder affecting speech and behavior.
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Asthma
Asthma is a chronic (long-term) disease of the lungs. It inflames and narrows the airways, making it harder to…
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Asthma in Kids
Asthma is a disease that often starts in childhood and makes it difficult for your child to breathe.
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Atherosclerosis
Atherosclerosis is a plaque build-up in your arteries.
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Attention-Deficit Hyperactivity Disorder (ADHD)
ADHD is a group of behaviors that can make it difficult to focus at school, work or home.
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Autism
Autism is a developmental brain disorder affecting social, behavioral, and communication skills.
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Avian Flu (Bird Flu)
Avian flu is a virus that is spread from bird to bird. In rare cases, certain strains of the virus…