<unk>  is described as<unk> ed when a boy or girl has passed the usual age of onset of<unk>  with no physical or hormonal signs that it is beginning.<unk>  may be<unk> ed for several years and still occur normally, in which case it is considered<unk><unk> , a variation of healthy physical development.<unk>  of<unk>  may also occur due to undernutrition, many forms of systemic disease, or to defects of the reproductive system (hypogonadism) or the body's responsiveness to sex hormones.
Constitutional delay of puberty
Hypogonadotrophic hypogonadism
Kallmann syndrome
Hyperpituitarism
Hyperprolactinemia
Kallman syndrome
Congenital adrenal hyperplasia
Hypopituitarism