Conditions and Treatments

Adrenal Insufficiency (Addison Disease)

Adrenal insufficiency is a disorder that occurs when the adrenal glands don't make enough of the hormone cortisol. This hormone controls blood pressure and affects how your immune system works.

Acute Spinal Cord Injury

A traumatic injury to the spine can cause a bruise, a partial tear, or a complete tear in the spinal cord. Read on for details about causes, symptoms, treatment, prevention, and management.

Allergic Rhinitis in Children

Allergic rhinitis can happen on a seasonal basis or year-round. There is often a family history of allergic rhinitis, eczema, asthma, or food allergy. Read on to learn details about treating and managing this condition.

Acoustic Neuroma

Acoustic neuroma is a rare noncancer tumor. It affects hearing and balance when the tumor presses on the nerves in the inner ear.

Acute Myeloid Leukemia (AML): Symptoms

Learn about the symptoms of acute myeloid leukemia (AML) and when to see your doctor.

Alcoholic Hepatitis

Alcoholic hepatitis is liver damage caused by drinking too much alcohol over time. Learn about symtpoms, diagnosis, treatment, and possible complications.

Attention-Deficit/Hyperactivity Disorder (ADHD) in Children

Attention-deficit/hyperactivity disorder (ADHD) is a brain-based, or neurodevelopmental, disorder. It is often first diagnosed in childhood.

Avascular Necrosis

Avascular necrosis develops when blood supply to a bone is cut off. This causes the bone to die and can cause pain and joint problems.

Autoimmune Hepatitis

Autoimmune hepatitis is when your body’s infection-fighting system (immune system) attacks your liver cells. This causes redness and swelling (inflammation) and liver damage.

Atrial Fibrillation

Atrial fibrillation, or AFib, is a kind of abnormal heart rhythm or arrhythmia. AFib increases the risk for blood clots. These clots can then travel to the brain, causing a stroke. This is why AFib significantly increases the risk for stroke.