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Myasthenia gravis is a complex autoimmune disorder. It causes antibodies to destroy the connections between your muscles and nerves. This causes muscle weakness and tiredness. ...

Group B streptococcus (strep) is a type of bacteria. It can be found in the digestive tract, urinary tract, and genital area of adults. GBS infection usually does not cause problems in healthy women before pregnancy. But it can cause serious illness for a newborn ...

Growth hormone (GH) deficiency is when the pituitary gland doesn't make enough growth hormone. GH is needed to stimulate growth of bone and other tissues. This condition can occur at any age. GH deficiency does not affect a child's intelligence. ...

Cold sores are small blisters around the mouth caused by the herpes simplex virus. They are sometimes called fever blisters. ...

Overview Addison disease is when the adrenal glands don't make enough of two steroid hormones. The hormones are cortisol and aldosterone. Cortisol controls the body's metabolism, blocks inflammatory reactions, and affects the immune system. Aldosterone manages sodium and potassium levels. The adrenal glands sit on ...

Asthma is a long-term (chronic) lung disease that causes your child's airways to become sensitive to certain things (triggers). ...

Young patients are finding hope in recovering function with specialized nerve transfer surgery performed by Amy Moore, MD, a Washington University plastic and reconstructive surgeon at St. Louis Children’s Hospital. ...

Menstrual cramps (dysmenorrhea) are severe, painful cramps that occur with menstruation. ...

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A ureterocele is a problem with a ureter. The ureters are 2 tubes that send urine from the kidneys to the bladder. A ureterocele is when part of a ureter right near the bladder becomes larger and bulges. ...