27/02/2026
Cortisol is a hormone your body releases when you feel stressed or under threat. It’s part of your built-in survival system. When something feels dangerous, cortisol helps your body focus on getting through it by putting less important jobs — like digestion, reproduction and parts of the immune system — temporarily on hold.
This response is meant to be short-term. It’s designed to help you deal with a stressful moment and then switch off once you’re safe again.
But with PTSD and C-PTSD, the body can struggle to switch that alarm system off. It can stay stuck in “threat mode”, even when there’s no immediate danger. That means cortisol levels can remain out of balance — too high for some people, and too low for others.
The connection between the mind and body is very real. When your mental health is suffering, your body feels it too. Over time, living with disrupted cortisol levels can start to affect your physical health in ways that feel confusing, unexpected, and sometimes worrying — such as:
❗️Your skin may scar more easily
❗️Your ears might ring
❗️You might gain weight around your tummy
❗️You might develop digestive issues like bloating, gas or IBS
❗️You might get frequent joint and muscle pains
❗️It can be difficult to gain muscle
❗️Your feet and hands might be icy cold
❗️You might yawn more
❗️Allergies may flare up, or you may develop new ones
If you’ve experienced any of these, you’re not imagining them.
PTSD and C-PTSD are not “just in your head”. They are whole-body conditions.
When your nervous system has been on high alert for a long time, your body adapts in ways that were once protective - but that can become exhausting and damaging over time.
When we live in survival mode, the body prioritises immediate threat over long-term health.
That’s why digestion, immunity, hormones and even temperature regulation can become disrupted. Your body isn’t broken - it’s trying to protect you.
Find out more about how PTSD and C-PTSD can physically affect your body in our blog article here:
https://www.ptsduk.org/10-unexpected-physical-symptoms-of-ptsd/
Find out more about how cortisol and PTSD and C-PTSD are linked (and how you can balance cortisol levels) here:
https://www.ptsduk.org/the-link-between-cortisol-and-ptsd/
PLEASE NOTE: These symptoms listed can also be an indication of other conditions - so if you experience any of these symptoms, you should speak to your GP to rule out anything more serious.