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Endometriosis What is endometriosis? The tissue that lines the uterus is called the endometrium. Normally, if a woman doesn’t get pregnant, this tissue is shed each month during her period. In endometriosis, tissue that looks and acts like endometrial tissue implants outside the

Infectious Mononucleosis (Mono) 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

Medicine Rashes in Children What are medicine rashes in children? Medicine rashes are the body’s reaction to a certain medicine. You may also hear these called drug rashes. The type of rash that occurs depends on the type of medicine that is causing it. Rashes can range from mild

Langerhans Cell Histiocytosis in Children What is Langerhans cell histiocytosis in children? Langerhans cell histiocytosis is a rare disorder. It occurs when there are very high levels of a type of immune cell called a Langerhans cell. In the past, this disorder was thought to be

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

Undescended Testes in Children What are undescended testes in children? Undescended testes means that 1 or both of the male testes have not passed down (descended) into the scrotal sac. This is a condition seen in some newborn baby boys. Most cases affect only 1 teste. About 1 in

Tension Headaches What is a tension headache? Tension headaches are the most common type of headache. Stress and muscle tension are often factors in these headaches. Tension headaches often don’t cause nausea, vomiting, or sensitivity to light. They do cause a steady ache, rather

Granulomatosis with Polyangiitis (GPA) What is granulomatosis with polyangiitis? Granulomatosis with polyangiitis (GPA) is an autoimmune disorder. An autoimmune disorder occurs when the body's immune system attacks and destroys healthy tissue. GPA causes inflammation, swelling

Toxic Epidermal Necrolysis in Children What is toxic epidermal necrolysis in children? Toxic epidermal necrolysis is a life-threatening skin disorder. It causes skin tissue to die, resulting in skin blistering and peeling. It's most often caused by a medicine reaction. A milder

Hives in Children What are hives? Hives (urticaria) are a sudden outbreak of red, itchy, and swollen areas on the skin. Hives can happen alone or as part of a severe allergic reaction. This condition often happens as an allergic reaction from eating certain foods or taking