Diseases and Conditions

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

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All conditions that start with the letter A
  • A doctor holds a bag of blood while talking to patient getting a blood transfusion because of anemia symptoms.


    Anemia is the most common blood disorder in the U.S. It affects your red blood cells and hemoglobin. Most people…

  • young African American businesswoman having chest pain


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

  • Young male runner sitting on the ground holding his sprained ankle in pain

    Ankle Sprains

    Ankle sprains range from mild to severe and need immediate treatment.

  • A men bent over clutching his side in pain due to appendicitis symptoms.


    Appendicitis is an inflammation or infection in your appendix. It can cause pain and swelling, and the appendix may burst…

  • Arrhythmia

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

  • Illustration of human heart and electrocardiogram graph representing heartbeat. Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a rare genetic heart problem that causes muscle cells in your ventricle wall to die.

    Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)

    Arrhythmogenic right ventricular cardiomyopathy is an uncommon genetic heart problem that causes muscle cells in your ventricle wall to…

  • Female therapist working with young boy on floor

    Asperger's Syndrome

    Asperger’s syndrome is a developmental disorder affecting speech and behavior.

  • young boy using spacer and mask with asthma inhaler


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

  • Asthma in Kids

    Asthma is a disease that often starts in childhood and makes it difficult for your child to breathe.

  • Atherosclerosis

    Atherosclerosis is a plaque build-up in your arteries.

  • boy leaning over table and looking off into distance

    Attention-Deficit Hyperactivity Disorder (ADHD)

    ADHD is a group of behaviors that can make it difficult to focus at school, work or home.

  • Upset autistic little boy covering his ears and feeling distressed and overwhelmed by the loud noises in preschool


    Autism is a developmental brain disorder affecting social, behavioral, and communication skills.

  • man plucking the feathers of a bird's corpse

    Avian Flu (Bird Flu)

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