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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.
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). A blood test (called serum testosterone level) is used to determine your level of circulating testosterone. A range of symptoms can occur if testosterone production drastically drops.