Testosterone is a primary male hormone that is crucial for many body functions, including boosting sex drive, maintaining bone density and muscle mass, and regulating fat distribution. It also plays a key role in sperm and red blood cell production and significantly impacts mood, energy, sexual drive, and aggression.
Testosterone production surges during puberty in boys and typically stabilizes by about the age of 30. At this point, it may begin to gradually decline. Testosterone levels in men can vary widely, with a normal range typically falling between 300 and 1000 ng/dL.
In adult men, low testosterone is generally defined as a level below 300 ng/dL. This measurement refers to nanograms of testosterone per deciliter of blood, which is how testosterone is commonly assessed in blood tests.
Low testosterone can manifest in various ways, but fatigue is often one of the earliest and most persistent symptoms. Here are some additional signs to watch for:
- Persistent tiredness despite adequate rest
- Difficulty focusing or experiencing mental fog
- Decreased physical strength and endurance
- Mood changes, including irritability, depression, or anxiety
- Decreased libido and sexual performance
If you’re experiencing any of these symptoms, it’s essential to consult your provider to assess your testosterone levels.