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andropause
Andropause — also colloquially known as male menopause — is said to be the result of a gradual drop in testosterone, which is an androgen. The medical community is currently debating whether or not men really do go through a well-defined menopause. The condition "andropause" is currently not recognized by the World Health Organization. When andropause occurs, it is considered to be a deficiency state in which the hormone testosterone goes below the normal range for an aging male.〔(“MedPage Today”, Testosterone Decline With Aging: What Is Normal?, October 3, 2012 )〕
Andropause is caused by the reduction of hormones testosterone and dehydroepiandrosterone in middle-aged men. Testosterone assists the male body in building protein and it is crucial for normal sexual drive and stamina. Testosterone also contributes to several metabolic functions including bone formation, and liver function. Andropause is also associated with a decrease in Leydig cells. A steady decline in testosterone levels with age (in both men and women) is well documented.
==Risk factors==
External factors that can cause testosterone levels to fall include certain forms of medication, poor diet, excessive alcohol consumption, illness, lack of sleep, lack of sex, stress, or surgery. It can also be a symptom of neuroendocrine dysfunction after a mild traumatic brain injury.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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