Typically, a man's testosterone level is considered low
if it's below 300 ng/dL. Low T can be caused by a signaling problem that occurs between the brain and the testicles that causes the production of testosterone to drop below normal. The brain may also signal the testicles to cut testosterone production if it feels the body has too much testosterone. Low T also can occur when your testicles can't make normal levels of testosterone. Low T is a medical condition that can lead to fatigue or low energy, decreased sexual function, and depressed mood.

Low T affects more than 13 million men in the U.S. over the age of 45. Even though it's natural for men to lose testosterone as they age, the medical condition hypogonadism (hî-põ-gõ-na-dizm), also known as Low T, is not a natural part of aging. Typically, there is no cure for Low T. It is a medical condition that may require ongoing treatment.

The good news is, Low T can be easily diagnosed by your doctor with a simple blood test and treated with testosterone replacement therapy (TRT) to bring your T levels back to normal.