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Early-Onset Alzheimer Disease What is early-onset Alzheimer disease? Alzheimer disease is the most common form of dementia. It affects your memory, thinking, and behavior. It often progresses to the point where it affects daily activities and functions. Alzheimer disease most

Anatomy of a Newborn Baby's Skull The skull may seem to be one large bone, but it's made of several major bones that are connected together. The major bones that compose the skull include: 2 frontal bones 2 parietal bones 1 occipital bone These bony plates cover the brain, and

Cholesterol in the Blood Facts about cholesterol Cholesterol is a fat-like, waxy substance that can be found in all parts of your body. It helps your body make cell membranes, many hormones, and vitamin D. The cholesterol in your blood comes from 2 sources: the foods you eat and

Pollen and Children What is pollen? Each grain of pollen is tiny (microscopic). When there is a lot of pollen together, it becomes a fine yellow powder. It's made of the male reproductive cells of flowering plants, trees, grasses, and weeds. It's the most common cause of hay

Anaphylaxis in Children What is anaphylaxis in children? Anaphylaxis is a severe, life-threatening reaction to an allergen. An allergen is something that your child is allergic to. Anaphylaxis is a medical emergency. Your child can have a reaction to an allergen within seconds or

Amenorrhea in Adolescents and Teens What is amenorrhea? Amenorrhea is a menstrual condition characterized by absent menstrual periods for more than 3 monthly menstrual cycles. Amenorrhea may be classified as primary or secondary: Primary amenorrhea. From the beginning and may be

Stroke in Children What is stroke in children? A stroke is a brain injury. It occurs when blood flow is interrupted to part of the brain. Stroke can be caused by a blocked blood vessel (ischemic stroke). Or it can be caused by bleeding in the brain (hemorrhagic stroke). The brain

Syncope in Children What is syncope in children? Syncope is a brief loss of consciousness and muscle tone (or posture) that can occur when not enough blood gets to the brain. Syncope is commonly called fainting. In most children, it’s usually harmless. But in a few children

Anorexia Nervosa What is anorexia nervosa? Anorexia nervosa is also called anorexia. It is a serious medical illness It's not a lifestyle choice. This eating disorder makes you obsess about your weight and food. If you have this problem, you may have a distorted body image. You

Overview of Sleep Disorders Facts about sleep disorders Loss of sleep can cause problems at home or on the job. It can lead to serious or even fatal accidents. The National Sleep Foundation notes that: Between 50 and 70 million U.S. adults have some type of sleep or wakefulness