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Tetralogy of Fallot (TOF) What is tetralogy of Fallot? Tetralogy of Fallot (TOF) is a set of 4 congenital heart defects that happen together. Tetralogy refers to the number 4. Congenital means that a baby is born with them. The set of 4 defects are: Narrowing (stenosis) of the

Hypoplastic Left Heart Syndrome (HLHS) in Children What is hypoplastic left heart syndrome in children? Hypoplastic left heart syndrome (HLHS) is a group of defects of the heart and large blood vessels. A child is born with this condition (congenital heart defect). It occurs when

Diabetes Insipidus in Children What is diabetes insipidus in children? Diabetes insipidus (DI) is a condition caused by not enough antidiuretic hormone (ADH) in the body. ADH is also known as vasopressin. This is a hormone that helps the kidneys keep the correct amount of water

Anemia in Children What is anemia in children? Anemia is a common problem in children. About 20% of children in the U.S. will be diagnosed with anemia at some point. A child who has anemia doesn't have enough red blood cells or hemoglobin. Hemoglobin is a type of protein that

Allergies in Children What are allergies in children? Allergies are problems of the immune system. Most allergic reactions happen when the immune system reacts to a “false alarm.” Normally, the human body defends itself against harmful things, such as viruses or bacteria. But

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

Latex Allergy What is a latex allergy? Natural rubber latex is a milky fluid found in rubber trees. There is a protein in the fluid that can cause allergic reactions in some people. Common products made using this natural rubber latex include gloves, condoms, rubber bands, and

Lactose Intolerance in Children What is lactose intolerance in children? Lactose intolerance is when the body can’t easily break down or digest lactose. Lactose is a sugar found in milk and milk products. If your child is lactose intolerant, your child may have unpleasant

Glomerulonephritis in Children What is glomerulonephritis in children? The kidneys contain many coils of tiny blood vessels. Each of these is called a glomerulus. Glomeruli filter substances from the blood into the urine. Glomerulonephritis is a type of kidney disease where these

Achondroplasia in Children What is achondroplasia in a child? Achondroplasia is the most common type of rare genetic bone disorder. The strong, flexible tissue called cartilage is not made into bone as normal. This causes a series of signs, such as short arms and legs and a large