How trauma affects the body
Trauma isn’t only something that happened in the past. It can change how your brain, nerves, hormones, and even your cells work today.
If you feel tired all the time, on edge, foggy, or sick more often than you used to, you’re not imagining it. And you’re not weak. Your body learned to survive, and it’s still doing that job.
Instead of “what’s wrong with me,” ask “what happened to me.”
Yvette Brown, Marriage and Family Therapist Trainee at Attune Center for Healing. Supervised by Christina Whitney, LMFT #111050.
Part 1
The brain and nervous system
Your brain’s main job is to keep you alive. After trauma, it can stay set to “danger” long after the danger is gone.
Brain chemistry
Trauma can change how the brain’s chemical messengers work. Dopamine (which drives motivation and reward) and serotonin (which helps steady your mood) can get out of balance. This can show up as tiredness, trouble focusing, low mood, and a stronger pull toward anything that numbs the pain, like alcohol or other substances.
Thought and habit pathways
The brain strengthens the paths it uses most, like a trail in the woods that gets deeper each time you walk it. Protective habits, like expecting the worst or bracing for conflict, get practiced over and over until they feel automatic.
Brain structure
Research has linked trauma to changes in key parts of the brain. The areas that help you think clearly and calm down (the prefrontal cortex), store memories (the hippocampus), and connect the two sides of the brain (the corpus callosum) can shrink. The brain’s alarm system (the amygdala) can grow larger and quicker to sound.
Brain waves
Your brain runs on electrical rhythms called brain waves. Trauma can throw these rhythms off, and the brain has to work around the problem. That can look like anxiety, feeling wired or foggy, and a hard time concentrating.
Nervous system
Your nervous system has a “go” side (fight or flight) and a “rest and recover” side. After trauma, the “go” side often stays switched on while the “rest” side lags behind. That makes it hard for your body to settle and find its balance.
Part 2
Hormones, immunity, and digestion
When your body thinks it’s in danger, it puts survival first and everything else second. That works in an emergency. It wears you down when the emergency never ends.
Stress hormones
Long-term release of stress hormones like cortisol and norepinephrine (a close cousin of adrenaline) keeps you on high alert and quick to react. Over time, it puts “less urgent” body jobs on hold and puts strain on many parts of the body.
Immune system
Cortisol helps manage your immune system. When cortisol is out of balance, your body’s inflammation response can swing too high or too low, a bit like a thermostat that keeps overshooting. Ongoing inflammation is linked to many long-term health problems.
Digestion and cleanup
In survival mode, digestion gets pushed to the back burner. Over time, your gut and the organs that clear waste from your body, like your kidneys, can end up under extra strain. That can add stress to your digestion and how your body uses energy.
Part 3
Cells and genes
Some of the effects of trauma reach all the way down to your cells.
Gene expression
Trauma and stress hormones can change which genes get turned “on” or “off” in your body, without changing the genes themselves. Scientists call this epigenetics. Some research suggests these changes may carry into the next generation when trauma goes unhealed.
Cell aging
Telomeres are protective caps on the ends of your chromosomes, like the plastic tips on shoelaces. Studies have linked trauma and long-term stress to shorter telomeres. That’s a sign of cells aging faster than they should, which can affect your health.
This is not the end of the story
Here’s the good news. The same brain that learned to stay on guard can learn to feel safe again. Your brain keeps changing all through life, and your nervous system can learn to settle.
Trying harder or “just stopping” a habit rarely works, because the habit isn’t the real problem. It’s your body’s way of protecting you. Real change comes from going underneath the behavior. That usually happens in three steps:
Feel safe and steady
We start with simple tools to calm your body and help you feel grounded.
Get to know your parts
We get curious about the parts of you that work so hard to protect you, instead of fighting them.
Heal the deeper wound
When you’re ready, we do the deeper work to resolve what’s driving the pain.
Healing looks different for everyone, and it takes time. There’s no one-size-fits-all timeline.
Brainspotting
A body-based approach that uses where you look to help your brain and body work through experiences that got stuck.
Parts work (IFS)
Internal Family Systems is a way of working with the different parts of yourself, like the part that worries or the part that keeps everyone happy.
Trauma therapy
Gentle, paced trauma therapy for women in Redding and by video across California, including neurofeedback.
Keep exploring
Curious how your past might still be showing up in your body? The free ACE quiz looks at common childhood experiences that research links to health later in life.
This page is education, not therapy. It’s not medical advice, and it doesn’t create a therapist-client relationship. If you have health concerns, talk with your doctor. If you are in immediate danger, call 911, or call or text 988.
Your body has been protecting you. Now it can heal.
You don’t have to figure this out alone. Let’s talk about what you’re carrying.