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
  • Abdominal Aortic Aneurysm (AAA)

    An abdominal aortic aneurysm is when a weak area in the aorta swells up like a balloon. It can cause…

  • Abnormal Uterine Bleeding

    Abnormal uterine bleeding is any heavy or unusual bleeding from the uterus (through your vagina). It can occur at any…

  • Abusive Head Trauma

    Abusive head trauma (shaken baby syndrome) is a form of child abuse that can be deadly or leave a baby…

  • ACL Injury

    ACL injuries have become more common among athletes, women, and children. PEP training programs can help with prevention.

  • Acne

    Acne is a common skin condition that develops when the hair follicles in your skin are blocked by dead skin…

  • Acute Bronchitis

    Learn about the symptoms, causes, treatment and prevention of acute bronchitis, a lung infection usually caused by a virus.

  • Addison’s Disease

    Addison’s disease is a condition that affects your body’s adrenal glands. It interferes with your body’s ability to produce certain…

  • Adhesive Capsulitis

    Adhesive capsulitis, or frozen shoulder, is the condition that occurs when inflammation in your shoulder eventually leads to difficulty moving…

  • Adult ADHD

    Adult ADHD does exist but may look slightly different than it does in children.

  • AIDS

    AIDS is a life-threatening condition caused by HIV. The virus attacks the body's immune system. Learn about AIDS, its treatment,…

  • Alcohol Abuse

    Alcohol abuse is a pattern of drinking too much alcohol too often. This can harm your work, school, and…

  • Allergic Conjunctivitis

    Allergic conjunctivitis is called “pink eye.” It causes your eye to become irritated, swollen, itchy, sore, and watery.

  • Allergic Rhinitis (Allergies)

    Allergic rhinitis is the medical term for hay fever or allergies.

  • Alopecia Areata (AA)

    Alopecia areata is an autoimmune disease that causes you to lose small, round patches of hair on your head.

  • Alzheimer's Disease

    Alzheimer’s disease is a type of dementia. The symptoms are associated with physical and functional changes in the brain.

  • Amblyopia

    Amblyopia (lazy eye) develops in childhood when one eye doesn’t work properly with the brain. Left untreated, it can lead…

  • Amenorrhea

    Amenorrhea is a medical term for when a woman does not have menstrual periods.

  • Anal Fissure

    Anal fissures are small tears in the lining of the lower rectum. They are usually caused by straining during a…

  • Anal Fistulas

    An anal fistula is an abnormal connection that forms between the anus and the skin outside of it. It usually…

  • Anaphylaxis

    Anaphylaxis is a life-threatening allergic reaction. Symptoms range from mild to severe, and immediate attention is necessary.