Testosterone should be referred to here as testosterone. Men lacking testosterone may have symptoms such as decreased libido, memory loss, hot flashes, erectile dysfunction, etc. Lack of testosterone in underage boys may lead to growth disorders, poor development of the reproductive system, and other manifestations. Testosterone is the main androgen in the human body, which can play a role in promoting growth and reproductive system development, maintaining sexual function, promoting protein synthesis and maintaining bone density. In adult males, when testosterone decreases there can be a series of symptoms such as decreased erectile function, decreased libido, decreased sperm activity, memory loss, premature ejaculation, decreased physical fitness and energy, irritability, hot flashes, and decreased muscle strength. In underage boys, testosterone deficiency may lead to impaired growth and development, poor reproductive system development, etc. When symptoms of suspected testosterone deficiency occur, it is recommended to visit a hospital for prompt treatment.