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It is important to distinguish between a normal decline of testosterone levels and hypogonadism. Signs and symptoms of low testosterone include: 1  Change in sleep patterns: insomnia or sleep disturbances. 2  Physical changes: increased body fat and reduced muscle bulk. 3  Sexual changes: reduced sexual desires, sexual dysfunction, or infertility.
Low Testosterone. Testosterone is a hormone that is produced by the human body. It is mainly produced in the testicles in men. It stimulates sperm production and a manâs sex drive and also helps build muscle and bone mass. Testosterone production typically decreases as men age.Men can experience a range of symptoms if it decreases more than it should. Low T is diagnosed when levels fall below a normal range (300- 1000 ng/dL, according to the U.S. Food and Drug Administration).omen often experience changes in mood during menopause, when their levels of estrogen drop. Men with low T can experience similar symptoms. Testosterone influences many physical processes in the body. It can also influence mood and mental capacity.