There can be both an indirect and direct way to achieve this. The reflex erection is the direct way, achieved by touching your penis to trigger the nerves in the lower part of your spinal cord and your peripheral nervous system. The psychogenic erection is the indirect way, via non-mechanical sexual stimulation (visual, for example) and sexual arousal. This activates the limbic system in your brain, sending electrical signals down to your erectile nerve centres via the lower regions of your spinal cord. The latter is why you can get both nocturnal or "morning glory" erections, rather non-erotically referred to as nocturnal penile tumescence. How romantic.
As the nervous system of autonomic response, the erection can result in different stimuli that include the sexual arousal and stimulation which is not even under the control of the conscious mind. The absence of the nocturnal erection is also used commonly for distinguishing between the psychological and physical cause of impotence and erectile dysfunction.

Both James and Michael fit the profile of millennial ED: healthy men with functional penises who experience occasional deflation for psychological reasons rather than mechanical issues (the latter of which typically plagues older men). Researchers and the medical community are aware of this specific problem facing younger men, says Landon Trost, MD, a urologist at the Mayo Clinic.


If you think you have erectile dysfunction, or ED, you’re bound to have questions for your doctor about what’s happening and how to fix it. Lots of men have been there. Don’t be afraid to talk to your doctor and ask him any and all questions you might have that can start you on the road to getting a solution. Here are the first six questions you should definitely ask:

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If you think you have erectile dysfunction, or ED, you’re bound to have questions for your doctor about what’s happening and how to fix it. Lots of men have been there. Don’t be afraid to talk to your doctor and ask him any and all questions you might have that can start you on the road to getting a solution. Here are the first six questions you should definitely ask:
Improve your nutrition. Certain foods, such as those that are fatty, fried, sugary, and processed, can result in decreased blood flow throughout your body and can contribute to a vascular form of erectile dysfunction. Increase your intake of fruits, vegetables, whole grains, and heart-healthy fats to improve your blood circulation and increase the amount of time you’re able to maintain an erection.
Stiffy Solution: The good news is, almost all of these conditions can be successfully treated if you catch them early on. And since erectile problems may be the first side effect your dude has experienced, seeking medical treatment for his erectile problems may be the thing to get him into a doctor's office. So if your dude is a well-rested, non-drinking, non-smoking, paragon of relaxation who suddenly can't get wood, urge him to talk to his doctor — his misbehaving penis may actually be communicating something way more important than "Not tonight, honey."
When these mental hang-ups happen in the moment (aka in bed), they can trigger his brain’s fight-or-flight response, which sends a message to his penis to shut things down. In this way, performance anxiety–induced ED is actually pretty similar to what women experience when our thoughts during sex make it hard to stay turned on and/or orgasm—we just don’t have an appendage that shows the evidence.

Condom troubles. Can the simple act of putting on a condom cause so much stress that it actually leads to erectile dysfunction? Sure it can — in fact, one recent survey of 234 young men conducted by the Children's Memorial Hospital in Chicago found that 25 percent had lost an erection while putting on a condom. “Putting on a condom requires a break from stimulation, and when it is on, it can reduce sensation,” says Dr. Montague.
Research has shown that the same eating patterns that can cause heart attacks due to restricted blood flow in the coronary arteries can also impede blood flow to and within the penis. The blood flow is needed for the penis to become erect. Diets that include very few fruits and vegetables along with lots of fatty, fried, and processed foods can contribute to decreased blood circulation throughout the body.
You may already know that lots of hard drugs — like cocaine, heroin, or Oxycontin — can cause sexual problems (though, quite frankly, if you're on cocaine, heroin, or Oxycontin, you have many more pressing concerns to deal with than getting dirrrty). But did you know that sometimes, even pot can inhibit erections? And you thought weed was just a harmless way to enjoy the musical stylings of Pink Floyd. Who knew it could actually mess with one's own pink floyd?
Medications. There are several different ED medicines that can help produce an erection, such as avanafil (Stendra), sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra). These medications work the same way: they relax smooth muscle and allow increased blood flow into the penis. Testosterone replacement and medications injected directly into your penis to help with erection are also common.
"Smoking is a short- and long-term cause of erectile dysfunction," warns Feloney. "In the short-term nicotine constricts the blood vessels that you need to get an erection, and in the long-term nicotine contributes to hardening of the arteries that can cause erectile dysfunction." Some approaches for quitting include making a clean break, avoiding the triggers of smoking, trying a nicotine patch or gum, and joining a smoke cessation program.
"When it's persistent and consistent, it's extremely likely to have biological factors" regardless of age, Dr. Irwin Goldstein, director of sexual medicine at Alvarado Hospital in San Diego and the director of San Diego Sexual Medicine, told Mic. But the cause of ED can also be psychological: For instance, if a man can get an erection on his own but not with a partner, then his ED is more likely to be rooted in performance anxiety or a deeper psychological issue. 

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"Diseases and illnesses can hamper one's ability to achieve an erection," he explains. "Cancer, diabetes and heart disease is the cause in many cases. Low testosterone count caused by genetics, inactivity or unusual level of estrogen in the body can limit penile function as well." High blood pressure and high cholesterol can also be detrimental to erections.
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.

what is the main cause of erectile dysfunction young men

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