Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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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…

  • Angina

    Angina is a heart condition that causes chest pain or pressure.

  • Ankle Sprains

    An ankle sprain is a stretched or torn ligament in your ankle. It is a common injury that can be…

  • Appendicitis

    Appendicitis is inflammation or infection in your appendix. If not treated, your appendix can burst. This can be serious, even…

  • Arrhythmia

    An arrhythmia is a change in the rhythm of your heartbeat. Your heart may beat too fast, too slow, or…

  • Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)

    Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a genetic condition that causes abnormal heart rhythms. It is more common in people…

  • Asperger's Syndrome

    Asperger’s syndrome is a developmental disorder on the autism spectrum that can be diagnosed in children as young as 18…

  • Asthma

    Asthma is a chronic (long-term) disease of the lungs. It inflames and narrows the airways, making it harder to…

  • Asthma in Kids

    Living with asthma as a child can be difficult. Asthma attacks interfere with a child’s physical activity, sleep, and can…

  • Atherosclerosis

    During atherosclerosis, plaque collects in your arteries and narrows them. This is dangerous as it limits the blood flow to…

  • Attention-Deficit Hyperactivity Disorder (ADHD)

    Attention-Deficit Hyperactivity Disorder (ADHD) is a group of behaviors that causes problems with focus and self control. It affects children…

  • Autism

    Autism is a developmental brain disorder that affects social, behavioral, and communication skills. Degrees of autism can vary, as can…

  • Avian Flu

    Avian flu is a virus that is spread from bird to bird. In rare cases, certain strains of the virus…

  • Babesiosis

    Babesiosis is an infection of the red blood cells. It’s caused by a parasite carried by deer ticks. It can…

  • Bacterial Endocarditis

    Bacterial, or infective, endocarditis (BE) is a type of infection. It occurs in the valves and inner lining of your…

  • Bacterial Vaginosis (BV)

    Bacterial vaginosis is a mild infection in the vagina caused by an overgrowth of bacteria. Researchers do not completely understand…

  • Barrett’s Esophagus

    Barrett’s esophagus is a condition that affects your esophagus. It happens when acid from your stomach goes back up into…

  • Bartholin's Gland Cyst

    The Bartholin’s gland is located on a woman’s vaginal lips. If skin grows over the opening to one of these…

  • Bedbugs

    Bedbugs are oval-shaped, wingless parasites. They have 6 legs and are about 1/5 of an inch long. They are white…

  • Bell’s Palsy

    Bell’s palsy is a condition that temporarily paralyzes the side of your face. It can affect all or part of…