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Adrenal Insufficiency (Addison Disease)

• Adrenal insufficiency is a disorder that occurs when the adrenal glands don't make enough of the hormone cortisol. Learn more about this condition, including the causes, symptoms, diagnosis, treatment, and complications.

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 during certain seasons 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.

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.

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.

Autistic Spectrum Disorder

• Autism spectrum disorder is a neurological and developmental disorder that usually appears during the first three years of life.

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.