How Psychological Erectile Dysfunction Works Physically

How your thinking/emotions affect your body and your erections.

By Brian Mahoney | Last Updated May 02, 2026
Medically Fact Checked by George Cushing, MD

How erections work normally

Your penis is a hydraulic system. When the muscles around the arteries of your penis relax, more blood flows in. Simultaneously, muscles at the base of your penis contract, preventing blood from leaving the penis. Blood flows in faster than it flows out. You get an erection.

Your nervous system has two modes:

  • Fight or flight: sympathetic
  • Rest and digest: parasympathetic

If you're in rest and digest mode, things work normally. You have good erections.

infographic of faucet and drain analogy for how healthy erections work



How erections get lost with psychological ED

If you're in fight or flight mode, the brain wants to protect you be diverting blood to the large muscle groups needed for immediate survival. So it sends a signal to groin.

Infographic view of a body with the brain triggering psychological erectile dysfunction

The small groin muscles that you want to loosen tighten and the muscles you want to tighten loosen. Not enough blood in the penis = no erection.

how psychological ED works infographic when the faucet muscle closes and the drain muscles the erection gets lost


REFERENCE

Coping with Erectile Dysfunction, Michael E. Metz PH.D. and Barry W. McCarthy, PH.D, pp. 32-34


→ To see how mental performance anxiety translates into a physical block, explore the core concepts in my guide to Understanding Psychological ED: First Steps.

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