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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.
Men do experience a decline in the production of the male hormone testosterone with aging, but this also occurs with conditions such as diabetes. Along with the decline in testosterone, some men experience symptoms that include fatigue, weakness, depression, and sexual problems. The relationship of these symptoms to decreased testosterone levels is still controversial.