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Arthritis Diagnosis Diagnosing arthritis may be difficult. There are more than 100 different types of arthritis. Many symptoms are similar among the different conditions affecting the joints. Arthritis may be generally categorized into the following groups: degenerative arthritis

Severe Combined Immunodeficiency (SCID) in Children What is SCID in children? SCID is a very rare disease. It causes a child to have a very weak immune system (immunodeficiency). As a result, the child is unable to fight off even mild infections. The disease is also known as the

Glomerulonephritis What is glomerulonephritis? When the kidneys' filters (glomeruli) become inflamed and scarred, it is called glomerulonephritis. The kidneys slowly lose their ability to remove wastes and excess fluid from the blood to make urine. How to say it gloh-MAYR-yoo-loh

Major Depression in Adolescents and Teens What is major depression? Major depression, also known as clinical depression or unipolar depression, is classified as a type of affective disorder (also called mood disorder) that goes beyond the day's ordinary ups and downs, and has

IgA Vasculitis in Children What is IgA vasculitis in children? IgA vasculitis is also called Henoch-Schönlein purpura (HSP). It's not contagious It involves swelling (inflammation) of small blood vessels. The swollen blood vessels leak into the skin, joints, intestines, and

Breast Cancer: Introduction What is cancer? Cancer starts when cells in the body change (mutate) and grow out of control. Your body is made up of tiny building blocks called cells. Normal cells grow when your body needs them, and die when your body doesn't need them any longer

Premenstrual Dysphoric Disorder (PMDD) What is premenstrual dysphoric disorder (PMDD)? Premenstrual dysphoric disorder (PMDD) is a much more severe form of premenstrual syndrome (PMS). It may affect people of childbearing age. It’s a severe and chronic health condition that needs

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

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

Stridor in Children What is stridor in children? Stridor is a noisy or high-pitched sound with breathing. It's a sign that the upper airway is partially blocked. It may involve the nose, mouth, throat, voice box (larynx), or windpipe (trachea). What causes stridor in a child