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Common Variable Immunodeficiency in Children What is common variable immunodeficiency in children? Common variable immunodeficiency (CVID) is an immunodeficiency problem that causes a child to have a low level of antibodies and a decreased responsiveness to some vaccines. This

Dehydration What is dehydration? Dehydration means that you don’t have enough water in your body. The human body normally contains a lot of water. In fact, 50% to 60% of your body weight comes from water. It helps keep your body healthy and working well. Mild dehydration can

Shingles What is shingles? Shingles (herpes zoster) is a common infection of the nerves. It is caused by a virus. Shingles set off a painful rash or small blisters on an area of skin. It can appear anywhere on the body, but it typically appears on only one side of the face or

Cytomegalovirus (CMV) in Newborns What is CMV in newborns? CMV (cytomegalovirus) is a type of herpes virus. It's very common. It affects people of all ages and in all parts of the U.S. In most cases, CMV causes mild symptoms, or no symptoms at all. But it can cause serious

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

Infectious Mononucleosis What is infectious mononucleosis (mono)? Infectious mononucleosis is a type of infection. It causes swollen lymph glands, fever, sore throat, and often extreme fatigue. It’s often spread through contact with infected saliva from the mouth. Symptoms can

Lupus What is lupus? Systemic lupus erythematosus (SLE or lupus) is an autoimmune disease that causes your body’s immune system to attack its own cells and tissues. It causes episodes of inflammation to various parts of the body. It can affect your joints, tendons, and skin. It

Diagnosis of Cystic Fibrosis How is cystic fibrosis diagnosed? Newborns are screened for cystic fibrosis (CF) as part of each state's newborn screening program. If the results are positive, it does not mean your baby has cystic fibrosis. More tests are done as described below. In

Psychological Complications of Chronic Illness Being a teen is stressful even for physically healthy teens. Chronic illness at this age can complicate development. The illness, treatment, and hospital stays all magnify concerns about how a teen looks. They also interfere with

Heart Failure in Children What is heart failure in children? The heart is a muscle that pumps oxygen-rich blood to all parts of the body. When you have heart failure, the heart is not able to pump as well as it should. Blood and fluid may back up into the lungs (congestive heart