The link between cortisol and PTSD

The link between cortisol and PTSD (and how to balance it)

Post Traumatic Stress Disorder (both PTSD and C-PTSD) are intensely complex and hard to understand conditions. There is no explanation for why some people develop PTSD or C-PTSD, while others exposed to a similar level of trauma appear to have no substantial, lasting effects.

It is certainly not an indication of character or emotional strength. Making it far more constructive to focus on dealing with it, rather than looking for the ‘why’.

However, this article provides an overview of an important area of research. One that may hold clues into both susceptibly to PTSD & C-PTSD and management of long term symptoms: we’ll answer the question “What is the connection between the hormone cortisol and PTSD & C-PTSD?”

This article explains what cortisol does, and some of the areas of scientific interest. Later, it also provides you with ways to balance your levels of cortisol to help manage PTSD & C-PTSD .

What is cortisol?

Like many other hormones that regulate your bodily functions, Cortisol is produced by your adrenal glands.

Consider cortisol as your body’s natural alarm system. It is the primary hormone involved in stress response and works alongside certain brain regions to regulate your mood, motivation, and fear.

Produced by your adrenal glands—small, triangular organs located on top of each kidney—cortisol has several key functions. It helps manage the utilisation of carbohydrates, fats, and proteins; suppresses inflammation; maintains blood pressure; raises blood sugar levels; regulates your sleep-wake cycle; and boosts energy to manage stress, helping to restore equilibrium once the stress has passed.

During times of stress, it also shuts off systems – like your digestion – to focus energy where it’s needed. Cortisol provides anti-inflammatory assistance too, as part of the preparation for any tissue repairs needed.

Your brain signals the adrenal glands if more cortisol is needed, or when it can reset to normal (more on this below).

Levels of cortisol and PTSD

The first point to make is that studies have shown that people diagnosed with severe mental health issues can sometimes have too high levels of this critical hormone.

Having your stress response system activated for a prolonged period can put too much cortisol in your system, for too long. Which is bound to influence your physical and mental health. This can happen due to genetics, or of course life experiences that lead to PTSD & C-PTSD .

However, don’t jump to the conclusion there is a clear-cut case that elevated cortisol makes people vulnerable to PTSD & C-PTSD and its symptoms. There are also indications that other individuals with mental health conditions such as PTSD have too little!

This suggests that it is an imbalance that can lead to a diverse range of physical and emotional effects. You will see this referred to as a derangement of cortisol levels.

How deranged cortisol levels can affect your body

We will look at low cortisol levels later, but first, what happens if the derangement is creating too much, for too long?

Cortisol is a stress warning to your body, and therefore it heightens alertness and creates fear.

When your brain ‘decides’ to put your body on full alert, the amount of cortisol produced increases. It can alter or even shut down certain functions, to keep you ready for ‘fight or flight’ for example

When the perceived danger is gone, your brain again adjusts the production of cortisol, calming it down and so allowing the rest of your body to ‘reset’ back to normal.

What happens if this ‘calm down’ message is never issued? Your alarm system is switched on around the clock and your body is continuously in stress mode.

This then impacts on your core bodily functions like digestion and sleep. So can see why elevated cortisol can result in significant physical issues too. Including sleep deprivation, digestive issues, migraines and even heart attacks.

You may also have problems with your moods, memory and concentration. As well as anxiety, or conversely depression.

Cushing’s Syndrome and PTSD

Too much cortisol can also be a symptom of a rare condition called Cushing’s Syndrome (also known as hypercortisolism), however, there is no indication that PTSD or C-PTSD or severe stress causes Cushing syndrome. It is a physiological ailment.

However, if you have undiagnosed chronic hypercortisolism (Cushing’s Disease) then you can be ‘hardwired’ to respond to stress in an extreme way.

This means that some people have symptoms of PTSD or C-PTSD which start to reduce immediately after or in the months following surgery to correct this glandular problem.

Too little cortisol

As mentioned above, there are also individuals who produce too little of this hormone as a result of PTSD or C-PTSD.

As your body is not getting sufficient quantities of ‘alert’ signals, symptoms include lethargy, low blood pressure, poor appetite and digestion, muscle weakness and changes in your skin, including dark patches.

Yes, people with PTSD and C-PTSD can have high levels of cortisol – but some also have low levels – this is why there’s no ‘test’ available for PTSD or C-PTSD using cortisol levels.

One study concluded that perhaps in the future that might be possible, with more research into the deficits and developmental issues that result in low cortisol production: “It might be possible, perhaps early in life, to identify individuals with reduced glucocorticoid metabolism who are at increased risk of PTSD and related disorders on exposure to trauma later in life.”

Neuroscientist Dr Rachel Yehuda (director of the traumatic stress studies at Mount Sinai School of Medicine in New York) has even put forward the view that traumatised adults have a lasting biological imprint due to this hormonal imbalance, which can then be passed down as a hereditary susceptibility to their children.

Things you can do to balance cortisol levels

As these deranged levels of cortisol can cause a multitude of physical, and mental symptoms, it would be ideal to be able to get them under control.

This involves taking steps to maintain an even level of cortisol, to help control your physical and emotional responses to triggers. Especially when your ‘reset’ is too slow, after elevated production of this hormone, leaving you on high alert long after the perceived threat has passed!

As we’ve noted, some people with PTSD or C-PTSD produce too much, and others too little cortisol. They key thing is that you want to try to balance these – so there are not ‘hard and fast’ rules to reducing or increasing them as such – the key part is balance. As such, here are some things you may wish to watch out for and consider when trying to balance your cortisol levels:

  • Cut down on caffeine Caffeine stimulates cortisol production, so either switching to decaf or reducing your consumption could help. (Watch out for caffeine in energy and cola drinks too.)
  • Make dietary adjustments
    • Vitamin B-rich Foods: Such as beans, bananas, oats, potatoes, and avocados, support adrenal function and energy production.
    • Vitamin C-rich Foods: Including oranges, lemons, grapefruits, peaches, mangoes, and tomatoes, which can stimulate cortisol production and boost immunity.
    • Omega-3 Fatty Acids: Found in fish oil, which studies suggest may help modulate cortisol levels during stress.
    • Tryptophan-rich Foods: Such as soybeans, seaweed, chia seeds, cheese, and egg whites, can have antidepressant effects and reduce stress.
    • Vitamin E Sources: Like sunflower oil, olive oil, and canola oil, can help combat oxidative stress.
  • Eating regularly helps too, so your body doesn’t become stressed by lack of nutrients, or you slip into comfort eating large amounts of food. Both can cause a surge in cortisol production.
  • Avoid alcohol and recreational drugs This is especially true when you are stressed, as even in small amounts, mind-altering substances can interact with cortisol levels to suppress your mood or build your stress levels higher.
  • Stay hydrated Drinking plenty of water during the day avoids a potential internal stress signal that triggers more cortisol.
  • Aim for regular sleep patterns Sleep and PTSD/C-PTSD are problematic – so we know this is much easier said than done. We’ve a few articles on our website about how to fall asleep in under one minute, how weighted blankets can help sleep, and how to reduce nightmares which might help. 
  • Moderate your exercise Intense exercise and strenuous activities over a prolonged period can actually boost your body’s production of cortisol. If you think this may be a factor – such as your stress levels are worse, not better, after exercise, then try switching to something more moderate.
  • Try relaxation therapies Journaling, meditation, yoga and other options to create a relaxed state, can help indicate to your brain that it can ‘wind down’ cortisol levels. Time with friends and family, feeling comfortable and loved, can also help with this.
  • Have fun! This may sound a strange suggestion, but studies have shown that a 15-20 minute belly laugh can significantly reduce your cortisol level! A great excuse to watch your favourite comedy film again. 

It’s important to note, that while choosing your PTSD or C-PTSDrecovery path you need to address both the symptoms and the underlying condition. NICE guidance updated in 2018 recommends the use of trauma focused psychological treatments for Post Traumatic Stress Disorder in adults, specifically the use of Eye Movement Desensitisation Reprocessing (EMDR) and trauma focused cognitive behavioural therapy (CBT).

Please remember, these aren’t meant to be medical recommendations, but they’re tactics that have worked for others and might work for you, too. Be sure to work with a professional to find the best methods for you.


Hello! Did you find this information useful?

Please consider supporting PTSD UK with a donation to enable us to provide more information & resources to help us to support everyone affected by PTSD, no matter the trauma that caused it


You’ll find up-to-date news, research and information here along with some great tips to ease your PTSD in our blog.

Sadia Gordon

‘I’m Having Distressing Thoughts’ – A dark comedy about the journey with C-PTSD Humour has long been recognised as a powerful tool for coping with challenging situations and providing relief in times of distress. For people with PTSD and C-PTSD,

Read More »

Case Study EMDR Treatment Rob

Case Study: EMDR Treatment – Rob Rob, a senior Detective within the UK Police Force was diagnosed with Complex PTSD as a result of the traumatic incidents he experienced in the line of duty. In this inspiring account, Rob opens

Read More »

Lucid Dreaming Study

Lucid Dreaming Study reveals a huge decrease in PTSD symptoms Today is National PTSD Awareness Day, which recognises the effects Post Traumatic Stress Disorder has on the lives of those impacted by it. The occasion coincides with the recent publication

Read More »

Small Charities Week

SMALL CHARITY WEEK: Recognising the value of small charities Small charities that provide huge support in the UK are being celebrated as part of Small Charity Week 19 – 23 June. During the Covid-19 pandemic and the ongoing cost-of-living crisis,

Read More »

Writing and PTSD Guest Blog

Guest Blog: How writing is helping me to cope with PTSD Many people with Post Traumatic Stress Disorder find that writing can help them to understand their PTSD or C-PTSD and the symptoms they are experiencing – whether that be

Read More »

How writing can help people with PTSD

How writing can help people with PTSD An empty notebook can suggest limitless possibilities. It’s also one of the simplest and best tools to improve your mental health, including when you have a diagnosis of post-traumatic stress disorder. Many people

Read More »

Treatments for PTSD

It is possible for PTSD to be successfully treated many years after the traumatic event occurred, which means it is never too late to seek help. For some, the first step may be watchful waiting, then exploring therapeutic options such as individual or group therapy – but the main treatment options in the UK are psychological treatments such as Eye Movement Desensitisation Reprogramming (EMDR) and Cognitive Behavioural Therapy (CBT).

Traumatic events can be very difficult to come to terms with, but confronting and understanding your feelings and seeking professional help is often the only way of effectively treating PTSD. You can find out more in the links below, or here.