What causes low testosterone? Primary vs. secondary hypogonadism in plain English
Low testosterone can start in the testes, the brain’s hormone signaling system, or from potentially reversible factors. Here’s why finding the cause matters.
Low testosterone symptoms: which ones actually point to low T
Low testosterone can cause symptoms like reduced sex drive, fewer morning erections, erectile difficulties, low energy, loss of muscle mass, and mood changes. But many of these symptoms have other causes. Sexual symptoms—especially a persistent drop in libido and fewer spontaneous or morning erections—tend to be more suggestive of low T, though only blood testing can confirm it.