How do erections work?

Medical review by
Dr. Matthew Chan
Written by
Mojo's Research Team
Published on
April 5, 2022
Table of contents

Here’s how erections work:

  1. Your brain senses sex might be on the cards and starts firing brain signals to tell your body it’s game on 
  2. These increase your heart rate and allow swift blood flow to your penis
  3. More messages travel down your nerves to tell the muscle at the bottom of the penis to tighten and hold the blood in
  4. Now you have an erection, sex can begin

Erectile dysfunction (ED) can occur when any of these stages get disrupted.

As these steps involve your brain, nerves, muscles, blood flow, hormones, mood (and more), you may have already guessed that ED has lots of causes. 

These broadly fall into two camps, physical and psychological - but they can also intermingle, so your erections can be negatively impacted by your body and your mind in different ways, all at the same time. 

If you want to learn more about your erections, our Erection Reset course is packed with expert-led information. Try it out for free today.

Editorial standards

Mojo aims to provide useful wellbeing resources to its users; however, you should not solely rely on opinions or advice available on the Website or given by the Community. Always seek advice from a qualified medical doctor or other healthcare professional before acting.

About the experts

Dr. Matthew Chan
Medical doctor and medical advisor for Mojo

A medical doctor and Mojo's medical advisor, Matt keeps what you read about erections and physical health accurate and evidence-based.

Learn more
Start your 3-day trial
Dismiss

Get matched with your program and take control of your sex life.