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

    Abdominal Aortic Aneurysm (AAA)

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

  • 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 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.

  • Patient and doctor sitting down for counseling session

    Alzheimer's Disease

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

  • young boy with adhesive eye patch over his eye

    Amblyopia

    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. Symptoms range from mild to severe, and immediate attention is necessary.

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