The human body has an endocrine system, which secretes hormones, and a nervous system that simultaneously regulates the metabolism and physiological functions of the human body. In a normal state, hormones maintain the body's metabolic balance and physiological functions. If for some reason the balance is disrupted, it will lead to endocrine disorders and cause some corresponding clinical manifestations. And one of the causes of endocrine disorders is traumatic brain injury.

Hypogonadism is a common condition in men aged 40 and over. Male hypogonadism is caused by a decrease in the hormone testosterone, leading to men being unable to achieve an erection or ejaculate.