SIADH is when the body makes too much antidiuretic hormone (ADH). This is a hormone that normally helps the kidneys conserve the correct amount of water in the body. SIADH causes the body to retain water. This lowers the level of sodium in the blood. SIADH is rare. It most often happens to children who are in the hospital.

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 characteristics. Precocious puberty happens before age 8 in girls, and before age 9 in boys.

An infant or young child who contracts hepatitis B is at greater risk of staying infected with the virus and of having lifelong liver problems, such as scarring of the liver and liver cancer.

Detailed information on posterior pituitary disorders

Pheochromocytoma is a tumor of the adrenal glands. The tumor makes hormones called epinephrine and norepinephrine. This leads to an excess of the hormones in the body. These hormones help manage heart rate and blood pressure, and they have other tasks. Too much of these hormones in the body causes problems.

Breast development occurs in distinct stages, first before birth, and again at puberty and during the childbearing years. Changes also occur to the breasts during menstruation and when a woman reaches menopause.

Detailed information on male growth and development

Detailed information on the most common types of mood disorders, including major depression, manic depression (bipolar disorder), dysthymia, seasonal affective disorder, and suicide

Detailed information on problems affecting the coronary arteries and blood vessels of children

Detailed information on the most common menstrual conditions, including premenstrual syndrome (PMS), premenstrual dysphoric disorder, amenorrhea, dysmenorrhea, and menorrhagia