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Actinic Keratosis What is actinic keratosis? Actinic keratosis (AK) is a rough, scaly spot or bump on sun-exposed skin. Most people with AK have more than one spot. AK is the most common precancer of the skin. Over time, it can develop into squamous cell skin cancer. Most

Bronchiolitis in Children What is bronchiolitis in children? Bronchiolitis is an infection of the lungs. It’s when your child has swelling in the smaller airways (bronchioles) of the lung. This swelling blocks air in the smaller airways. Bronchiolitis is different than bronchitis

Encephalitis in Children What is encephalitis in children? Encephalitis is inflammation of the brain. The inflammation causes the brain to swell. This leads to changes in a child's nervous system that can include confusion, changes in alertness, and seizures. Meningitis often

About Cancer Clinical Trials What are cancer clinical trials? Cancer clinical trials are research studies with people. They may be done by government agencies, educational organizations, private not-for-profit groups, or commercial businesses. Trials are used to check how safe

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

Food Allergy What is a food allergy? A food allergy is when your immune system has a bad reaction to a certain food. This is different from a food intolerance, which does not involve the immune system. This is true even though some of the same signs may be present. What causes it

Atopic Dermatitis What is atopic dermatitis? Atopic dermatitis is a long-term (chronic) skin disorder. It causes dry, itchy, scaly patches. The patches are often on the face and the head in babies. It's most common in infants or very young children. Most will show signs of the

Color Blindness What is color blindness? Color blindness is when you see colors differently than most people do. The retina is the light-sensitive lining in the back part of your eye. It sends visual information to your brain. Your retina has special cells that detect color

Atrial Septal Defect (ASD) in Children What is an atrial septal defect in children? The atrial septum is the wall between the two upper chambers of the heart (right and left atria). An atrial septal defect (ASD) is an abnormal hole in this wall. ASD is a heart problem that is