Why do some experiences seem to stay with us? And not just in memory, but in how we react, feel, and even move through the world? For many people, trauma doesn’t simply fade with time. Instead, it can influence how certain genes are turned on or off. This is the connection between epigenetics and trauma.
Rather than changing our DNA itself, trauma can influence how certain genes are expressed, affecting how our bodies respond to stress, emotion, and safety. But because epigenetics is flexible, healing experiences can shape gene expression too.
To help you understand how trauma changes gene expression, this article will walk you through:
- What epigenetics is and why it matters for mental health
- How trauma affects the body and brain
- How trauma changes gene expression
- Everyday experiences that influence gene expression
- How therapy supports epigenetic healing.
- Answers to commonly asked questions about environment and gene expression in mental health
What Is Epigenetics, and Why Does It Matter for Mental Health?
Epigenetics is the study of how our environment (diet, exercise, stress) affects our genes by changing the chemicals attached to them without changing the DNA itself.[1] When we think of the word “genetics,” we usually think of something that is fixed or unchangeable. Epigenetics doesn’t focus on the genes themselves, but rather how those genes are turned “on” or “off” over time.
One way to think about it is this: your DNA provides the instructions, but epigenetics helps decide which instructions get used. These shifts don’t alter your genetic code. Instead, they influence how your body reads and responds to it.
This is especially relevant in relation to environment and gene expression in mental health, because our surroundings, relationships, and stress levels can all play a role in shaping that process. Understanding these connections can also help explain mental health risk factors connected to epigenetics, particularly if you have a history of chronic stress or traumatic experiences.
Researchers studying the neuroscience of trauma and genes have found that life experiences, especially early or repeated stress, can leave biological “imprints” that shape mental health over time.[2] Research on epigenetic changes in depression suggests that prolonged stress can influence how the systems responsible for mood operate in the brain.
[3]The reason epigenetics matters for mental health is that it can help us understand how our experiences influence the way mental health conditions develop. It also gives us a way to protect against mental health conditions by addressing trauma or chronic stress, taking care of diet and exercise, and avoiding harmful substances.
How Does Trauma Impact the Body at a Biological Level?
To understand how epigenetics and trauma connect, it helps to look at what happens in the body during a stressful or overwhelming experience. Trauma isn’t just something we “remember”, it’s something the body reacts to in real time.
When we encounter a threat, the nervous system activates a survival response, often described as fight, flight, or freeze. This response protects us from perceived threat. Stress hormones like cortisol and adrenaline are released, your heart rate increases, and your body prepares to act quickly. In short bursts, this system works exactly as it should and can actually be very useful in helping us focus and respond to the situation.[4]
But problems occur when the stress continues or is extreme. When your body is repeatedly exposed to stress, it stays on high alert. That heightened state becomes the new normal, influencing stress and gene expression, and reinforcing patterns where the body stays alert even when danger is no longer present.
So, the body adapts to its environment, and if that environment feels unpredictable or unsafe, it may “adjust” by becoming more sensitive to potential threats. This can show up as hypervigilance, emotional reactivity, or difficulty relaxing. All of these can impact mental health, contributing to anxiety, depression, or other conditions.[5] This is particularly important with regard to childhood trauma and its long-term effects, as early experiences can shape these biological responses during critical periods of development.
Again, this doesn’t mean trauma permanently alters your DNA. Rather, it influences how your body uses the information already there.
How Trauma Leaves a Lasting Mark on Gene Expression
One of the ways stress or trauma shows up is in how the body “sets” its baseline. After repeated or intense experiences, systems involved in mood, memory, and threat detection can become more sensitive. So if you experience ongoing stress, you may notice your body reacts quickly, even in relatively neutral situations. This reflects deeper patterns of stress and gene expression, where the body has adapted to prioritize protection.
Trauma affects gene expression by turning on the parts of the DNA that help you stay alert and prepared, even when you’re no longer experiencing the trauma. This change in how your genes are expressed can cause you to:
- React strongly to stress, even when it seems manageable
- Feel emotionally overwhelmed more quickly than expected
- Struggle to return to a calm baseline after something upsetting
- Sense tension in the body without a clear reason
Seen through this lens, these reactions begin to make more sense. They are not signs that something is “wrong,” but signs that your system has adapted to what it went through. These patterns can persist for years, which is why addressing childhood trauma and its long-term effects often requires specialized support that works with both the mind and body.
Everyday Experiences That Influence Gene Expression
While trauma can shape how the body responds to stress, it’s only one part of the picture. The same science behind epigenetics and trauma also shows that everyday experiences, especially consistent, supportive ones, can influence how your genes get expressed over time.
Our bodies are constantly taking in signals from our surroundings and adjusting accordingly. These signals don’t have to be extreme, and in fact, small, repeated experiences often have the most lasting impact.
Some of the most influential factors include:
- Safe, supportive relationships: Feeling understood and emotionally supported can help regulate the nervous system and reduce chronic stress signals.[6]
- Sleep and rest: Consistent sleep supports brain function and helps stabilize systems involved in mood and stress response.[7]
- Nutrition: Regular, balanced meals provide the body with the resources it needs to maintain emotional and physical stability.
- Movement: Physical activity can help release built-up stress and support overall regulation.[8]
These experiences may seem simple, but they can help with healing trauma at an epigenetic level. When the body begins to experience more moments of safety and regulation, it can shift away from a constant state of alertness. These consistent positive experiences may help reduce mental health risk factors related to epigenetics by gradually changing how stress-related genes are expressed.
How Therapy Supports Epigenetic Healing
If trauma can influence how the body responds at a biological level, then healing has to involve the body, too, not just thoughts or insight. This is where therapy becomes especially valuable, as it helps your system begin to respond differently over time.
Mental health treatment for trauma biology works by creating repeated experiences of safety, regulation, and connection. Here is how different therapeutic approaches support this process:
- Cognitive behavioral therapy (CBT): Helps identify and reshape thought patterns that reinforce stress responses, creating more flexibility in how you interpret situations.
- Trauma-informed therapy: Focuses on building a sense of safety first, so the nervous system isn’t overwhelmed while processing difficult experiences.
- Eye movement desensitization and reprocessing (EMDR) and somatic approaches: Work more directly with how trauma is stored in the body, helping to reprocess and release stuck stress responses.
From the perspective of the neuroscience of trauma and genes, consistent therapeutic support can help “retrain” how the body reacts to stress.
FAQs About Epigenetics and Trauma
Understanding the connection between biology and lived experience can raise a lot of questions. Below are answers to some of the most common concerns about epigenetics and trauma, and what it means for mental health and healing.
Can Trauma Alter Genes?
Trauma does not change actual DNA sequences, but it can influence how the instructions in the DNA get used. Through epigenetic processes, stressful or overwhelming experiences can affect how certain genes related to stress response, mood, and emotional regulation are activated. So while trauma does not rewrite your genetic code, it can leave an imprint on DNA that impacts how you manage challenges.[2]
How Does Epigenetics Relate to Trauma?
Epigenetics relates to trauma by explaining how trauma changes gene expression. When the body experiences repeated or intense stress, it sends signals that can influence how genes function, particularly those involved in stress regulation. This connection between stress and gene expression is a key part of understanding why trauma can have lasting emotional and physical effects. It also helps explain why some people are more vulnerable to mental health conditions following difficult experiences.
Can Trauma Be Passed Down?
Research into generational trauma and epigenetics suggests that, yes, trauma can be passed down. The research shows that people who experience trauma, especially violent trauma, can have epigenetic changes that also appear.[9] Inherited trauma and mental health leave an imprint that can get passed down. But trauma impact on future generations doesn’t mean you will have trauma if your parent had it. Instead, it just means your body may respond differently to stress or impact how you relate to others or create a sense of safety. Understanding this can help families recognize patterns and seek support earlier.
Can You Heal Epigenetic Trauma?
Yes, you can heal epigenetic trauma through consistent, supportive experiences, including therapy, relationships, and lifestyle changes. Over time, these positive inputs can help regulate stress responses and support healthier emotional patterns. Healing doesn’t happen overnight, but the brain and body remain adaptable throughout life. This adaptability is at the core of healing trauma through epigenetics-informed approaches.
Does Mission Connection Help With Epigenetic Trauma?
While treatment doesn’t directly target genes, we provide care that supports the systems affected by trauma. Our compassionate, trauma-informed clinicians use evidence-based therapies that will help you regulate your nervous system, process past experiences, and build
more adaptive ways to respond. We address both the cognitive and physical impacts of trauma through therapies like CBT, somatic methods, and EMDR so your brain and body learn to feel safe again.
References
- Dupont, C., Armant, D., & Brenner, C. (2009). Epigenetics: definition, mechanisms and clinical perspective.
- Roth, T. et al. (2009). Lasting epigenetic influence of early-life adversity on the bdnf gene.
- Aljabali, A. et al. (2024). Deciphering depression: epigenetic mechanisms and treatment strategies.
- Dhabhar, F. (2018). The short-term stress response – mother nature's mechanism for enhancing protection and performance under conditions of threat, challenge, and opportunity.
- Davis, M. et al. (2017). Neurobiology of chronic stress-related psychiatric disorders: evidence from molecular imaging studies.
- Martino, J., Pegg, J., & Frates, E. (2015). The connection prescription: using the power of social interactions and the deep desire for connectedness to empower health and wellness.
- Ibrahim, A., Högl, B., & Stefani, A. (2025). Sleep as the foundation of brain health.
- Childs, E., & De Wit, H. (2014). Regular exercise is associated with emotional resilience to acute stress in healthy adults.
- Mulligan, C. et al. (2025). Epigenetic signatures of intergenerational exposure to violence in three generations of syrian refugees.