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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

Hydrocephalus What is hydrocephalus in children? A baby with hydrocephalus has extra fluid in and around the brain. This fluid is called cerebrospinal fluid (CSF). Most CSF is normally found in fluid-filled areas (ventricles) inside the brain. Its purpose is to cushion and

Blood Clotting Disorders in Children What are blood-clotting disorders in children? Blood-clotting disorders are a group of conditions in which there is too much clotting. Blood clotting is a normal process. It stops you from bleeding too much when you have a cut or injury. Blood

Appendicitis What is appendicitis? Appendicitis is a medical emergency. It happens when your appendix becomes sore, swollen, and diseased. The appendix is a thin tube that is joined to the large intestine. It sits in the lower right part of your belly (abdomen). The appendix is a

Becker Muscular Dystrophy in Children What is Becker muscular dystrophy in children? Muscular dystrophy (MD) is an inherited (genetic) disorder of the muscles. It is called a neuromuscular disease. There are several types. Becker muscular dystrophy (BMD) is a rare type. It

Claudication What is claudication? Claudication is pain in your thigh, calf, or buttocks that happens when you walk. It can make you limp. It may be a symptom of peripheral artery disease (PAD). This means that narrowed or blocked arteries have reduced the blood flow to your legs

Phenylketonuria (PKU) in Children What is phenylketonuria (PKU) in children? Phenylketonuria (PKU) is a rare metabolic disorder. Children with PKU can’t process an amino acid called phenylalanine. Phenylalanine is in many common foods. It helps the body make protein. It's also

Psoriatic Arthritis in Children What is psoriatic arthritis in children? Psoriatic arthritis is a rare form of arthritis, or joint inflammation, that affects the skin and joints. It's an ongoing (chronic) autoimmune condition. It causes a red, scaly, itchy rash. It also causes

Chronic Bronchitis What is chronic bronchitis? Bronchitis is inflammation of the breathing tubes. These are the airways called bronchi. This inflammation causes too much mucus to be made and other changes. Bronchitis can be acute (short-term) or chronic (long-term). Chronic

Tourette Syndrome in Children What is Tourette syndrome in children? Tourette syndrome (TS) is a neurological problem. It is also called Tourette disorder. The syndrome causes repeated tics. Tics are sudden, uncontrolled vocal sounds or muscle jerks. Symptoms of TS often start