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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
  • Illustration of a human body with close-ups of a normal aorta and one with an abdominal aortic aneurysm

    Abdominal Aortic Aneurysm (AAA)

    Sometimes an area of a blood vessel wall will get weak. It can start to swell like a balloon and…

  • A woman talking to her doctor

    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

    An ACL injury is the overstretching or tearing of the anterior cruciate ligament in your knee. It is a common…

  • Acne

    Acne is a common skin condition. It causes bumps on the skin known as pimples to appear on the face…

  • Acute Bronchitis

    Acute bronchitis is a contagious viral infection that causes inflammation of the bronchial tubes (the airways that carry air into…

  • Stethoscope resting on black chalkboard with the words Addison’s Disease

    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…

  • Man sitting on sofa, holding shoulder in pain

    Adhesive Capsulitis

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

  • Bad student distracted listening to music sitting in a classroom

    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 human immunodeficiency virus (HIV). The virus makes your body weak and unable to…

  • silhouette of a person drinking, sitting behind bottles of alcohol

    Alcohol Abuse

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

  • woman putting drops in her eye

    Allergic Conjunctivitis

    Allergic conjunctivitis occurs when you’re around things you’re allergic to. These allergens can make your eyes swollen, irritated, and…

  • man with allergies outside blowing his nose, allergic to trees in background

    Allergic Rhinitis (Allergies)

    Allergic rhinitis is the medical term for nasal allergies. These can seasonal or perennial and can be treated medications or…

  • Alopecia Areata (AA)

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

  • Patient and doctor sitting down for counseling session

    Alzheimer's Disease

    Alzheimer’s disease is a type of dementia that is most common in people over the age of 65. There is…

  • young boy with adhesive eye patch over his eye

    Amblyopia is sometimes called “lazy eye.” If left untreated, it can affect a child’s vision permanently.

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

  • Woman holding clean menstrual pad

    Amenorrhea

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

  • Doctor talking to patient in office

    Anal Fissure

    An anal fissure is a small crack or tear in the thin, moist lining of the lower rectum. It’s a…

  • Doctor talking to patient

    Anal Fistulas

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

  • Woman injecting emergency medicine (EpiPen) into her leg

    Anaphylaxis

    Anaphylaxis is a life-threatening allergic reaction that needs immediate medical attention.

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