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Portal hypertension is an increase in pressure within the portal vein, the vessel that carries blood from the intestines and the spleen to the liver.

Post-traumatic stress disorder (PTSD) is a serious mental health condition that affects people who have survived a terrifying physical or emotional event.

Urethral valves occur when a boy is born with extra flaps of tissue that have grown in his urethra.

Precocious, or early, puberty is when a child enters the process of becoming sexually mature too early.

Premature adrenarche is characterized by changes in the body as your child enters her teen years.

A baby born before 37 weeks of pregnancy is considered premature. Slightly fewer than 12 percent of all babies are premature.

As many as 75 percent of girls and women experience unpleasant symptoms or painful pelvic cramps before or during their monthly menstrual cycle, called premenstrual syndrome (PMS).

Primary immunodeficiency disorders (PIDDs) are a group of inherited conditions affecting the immune system.

Phelan-McDermid syndrome, also called 22q13 deletion syndrome, is a genetic disorder caused by deletion of part of chromosome 22 or a defect in a gene called SHANK3.

A pilocytic astrocytoma is a brain tumor that originates from star-shaped cells called astrocytes.