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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

Herpes Simplex Virus (Cold Sores) in Children What are cold sores in children? Cold sores are small blisters around the mouth caused by the herpes simplex virus. They are sometimes called fever blisters. What causes cold sores in a child? The most common cause of cold sores is

Precocious Puberty What is precocious puberty? Puberty that happens early is called precocious puberty. This means a child's physical signs of sexual maturity develop too soon. This includes breast growth, pubic hair, and voice changes. These are known as secondary sexual

Phobias in Children What are phobias in children? A phobia is an excessive fear of a certain object or situation. It's a fear that lasts for at least 6 months. It is a type of anxiety disorder. These are some different types of phobias: Specific phobia. A child has anxiety when

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

Vesicoureteral Reflux (VUR) in Children What is vesicoureteral reflux in children? Vesicoureteral reflux (VUR) is a condition in which 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

Occupational Lung Diseases What are work-related lung diseases? Work-related lung diseases are lung problems that are caused by certain work environments. They are caused by breathing materials into the lungs. These lung diseases may have lasting effects, even after the exposure

Anencephaly in Children What is anencephaly in children? Anencephaly is a condition that is present at birth (birth defect). It affects the brain and skull bones. With this condition, the brain isn't fully formed. It often lacks part or all of the cerebrum. The cerebrum is the

Color Blindness What is color blindness? Color blindness is when you see colors differently than most people do. The retina is the light-sensitive lining in the back part of your eye. It sends visual information to your brain. Your retina has special cells that detect color

Emphysema What is emphysema? Emphysema is a progressive chronic lung condition in which the tiny air sacs (alveoli) are damaged or destroyed. When this happens, it causes the tiny air sacs to rupture and create one big air pocket instead of many tiny ones. Air becomes trapped in