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Chickenpox What is chickenpox? Chickenpox is a common childhood disease. It causes an itchy, blistering rash and is easily spread to others. Until the varicella vaccine for chickenpox became available in 1995, chickenpox infection was very common. Almost everyone had been

High Blood Pressure/Hypertension What is high blood pressure? Blood pressure is the force of the blood pushing against the artery walls. The force is made with each heartbeat as blood is pumped from the heart into the blood vessels. This is called systolic blood pressure. Blood

Male Infertility What is male infertility? Infertility is a disease of the reproductive system. It makes a person unable to have children. It can affect a man, a woman, or both. Male infertility means that a man has a problem with his reproductive system. It means you can't start

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

X-Linked Agammaglobulinemia in Children What is X-linked agammaglobulinemia in children? X-linked agammaglobulinemia is a rare genetic disease. It causes a weakened immune system. It is also known as Bruton's agammaglobulinemia. X-linked means that the gene that causes this

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

Ureterocele and Ureteral Duplication in Children What is a ureterocele and ureteral duplication in children? A ureterocele is a problem with a ureter. The ureter is a tube that connects the kidney to the bladder. There is 1 ureter for each kidney. The ureters send urine from the

Juvenile Ankylosing Spondylitis (JAS) in Children What is juvenile ankylosing spondylitis in children? Juvenile ankylosing spondylitis is a type of arthritis. It affects the spine and the places where the muscles, tendons, and ligaments attach to the bone. Ankylosing means stiff

Immune Thrombocytopenic Purpura in Children What is immune thrombocytopenic purpura (ITP) in children? ITP is a blood disorder that causes a decrease in the number of platelets in the blood. Platelets help stop bleeding. So a decrease in platelets can result in easy bruising

Vesicoureteral Reflux (VUR) in Children What is vesicoureteral reflux in children? Vesicoureteral reflux (VUR) is a condition where urine in the bladder flows in the wrong direction. It goes up into the tubes (ureters) that lead to the kidneys. It often flows all the way back up