Hormones, blood vessels, nerves, and muscles must all work together to make an erection. Your brain starts an erection by sending nerve signals to the penis when it senses sexual stimulation. Touching may cause this arousal. Another trigger may be something you see or hear. It may be a sexual thought or dream.
Your brain starts an erection by sending nerve signals to the penis.
The nerve signals cause the muscles within the penis to relax and let blood flow into the spongy tissue within the penis. Blood collects in this tissue like water filling a sponge. The penis becomes larger and firmer, like an inflated balloon. The veins then get shut off to keep blood from flowing out.
After climax, or after the sexual arousal has passed, the veins open back up and blood flows back into the body.
Healthy blood vessels are needed for an erection.
Source: National Kidney and Urologic Diseases Information Clearinghouse
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Alot of men are too embarrased to go to the doctor about it. It’s their manhood and pride that are being affected and speaking to their doctor about it will feel to them like the worst thing in the world. What they don’t realise is their doctor is professional and probably sees dozens of ED cases a week. It’s just another day for him. He’s not going to judge you, or embarrass you. He’s there to help you.