Low testosterone? There are many reasons: stress maladaptation, nutrient deficiency, environmental estrogen deficiency, sleep apnea, etc etc. What are the symptoms? Most people think it’s erection but only one and three men with erectile dysfunction (ED) actually have low testosterone. Also, another little known fact is that taking testosterone levels at doses that are too high can actually cause ED (ED may be more about the estrogen testosterone ratio and other factors). The major symptoms are