Growth hormone deficiency is caused by low or absent secretion of growth hormone from the pituitary gland. This can be caused by congenital (a condition that is present at birth) or acquired (a condition that occurs after birth) conditions. Congenital growth hormone deficiency may be associated with an abnormal pituitary gland, or it may be part of another syndrome. In normal aging, there is a decrease in the amount of growth hormone secreted each day and in the pattern of secretion. It is not clear if this is clinically important or requires any additional administration. Acquired causes of growth hormone deficiency include infections; brain tumors; and injury, surgery, or radiation to the head. In some cases, no causes can be identified.

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