"Some physical problems that can lead to weak erections are the inability of your brain to send signals to your penis, which can be caused by neurological conditions like MS, Parkinson's disease and Alzheimer's," adds Axe. "Studies suggest that stress, anxiety and depression can produce major chemical changes in your brain, leading to the inability of smooth muscles to relax and allow for an erection. On top of this, researchers have also indicated that the failure to achieve an erection can aggravate a man's anxiety levels, leading to a vicious cycle."

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As it turns out, there are actually tons of things that can keep guys from getting an erection that have nothing to do with you (also, all that stuff you learned in middle school about how all guys are hump-crazed sex lunatics might have been slightly off). Between 20 and 30 million American men experience recurring erection difficulties, and almost all men have, at one time or another, had their top ramen refuse to boil. And while erectile issues are often seen as an older man's problem, in reality, one quarter of men seeking medical treatment for erectile difficulties are under 40.
In an article on Men’s Health about things that wreck your erection, some examples of threats to an erection are sugar, lack of sleep, sleeping near a newborn baby, and lack of vitamin D. The common theme in the article is that reduced testosterone impacts your erection. Not all scientists agree with that. But there are definitely links between testosterone and erectile problems. 

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