What kind of brain damage does chronic stress cause?
Chronic stress shrinks specific brain regions. In a 2025 study of 52 people with chronic pain and 38 healthy controls, higher stress levels were linked to smaller grey matter volume in the left and right putamen—areas involved in movement and learning—and in the left middle cingulate cortex, a region critical for empathy and pain processing [1]. The effect was dose-dependent: the more severe the stress, the more shrinkage, especially in people with chronic pain.
At the cellular level, chronic stress triggers oxidative stress—a chemical imbalance that damages cells. A 2017 rat study found that 21 days of restraint stress increased malondialdehyde (MDA), a marker of oxidative damage, by a statistically significant amount (p < 0.001), while depleting protective antioxidants like glutathione and superoxide dismutase [2]. This oxidative assault can kill neurons directly.
Stress also damages DNA. A 2024 study on house sparrows showed that chronic stress increased double-stranded DNA breaks in multiple tissues, including the brain [6]. The hypothalamic-pituitary-adrenal (HPA) axis—the body's central stress response system—was the driver of this damage, not the sympathetic nervous system [6].
Can the damage be reversed or prevented?
Some interventions show promise. In a 2017 rat study, the antioxidant compound carnosol (found in rosemary) reversed stress-induced oxidative damage: it lowered MDA levels and restored antioxidant enzymes to near-normal levels (p < 0.001), with effects comparable to the antidepressant fluoxetine [2]. This suggests that boosting the brain's antioxidant defenses can counteract some stress damage.
Bioactive peptides from fermented milk also protected against stress-induced brain damage in mice. A 2023 study found that two specific peptides (Pep14 and Pep21) reduced anxiety-like behavior and suppressed neuroinflammation by regulating the HPA axis [7]. They worked by lowering expression of inflammatory markers in the colon and brain, linking gut health to brain protection [7].
However, cognitive impairments from chronic stress are notoriously hard to treat. A 2024 review notes that unlike mood symptoms, stress-related cognitive deficits—such as poor working memory and reduced cognitive flexibility—often persist even after successful treatment of the underlying disorder [3]. This highlights the need for targeted therapies that address the brain damage directly, not just the stress symptoms.
About These Sources
This answer is built on 7 peer-reviewed studies — published from 2017 to 2025, 3 from 2024 or later, 2 in Q1 journals, collectively cited 503 times — selected as the most relevant from 8 studies that passed quality screening, drawn from 50 papers retrieved from a database of over 500 million.
Sources used in this answer
Stress-Related Brain Alterations in Chronic Pain.
In 52 chronic pain patients and 38 healthy controls, higher stress severity was linked to smaller grey matter volume in the putamen and middle cingulate cortex, with effects differing between groups.
Protective effects of carnosol against oxidative stress induced brain damage by chronic stress in rats.
In rats, 21 days of restraint stress increased oxidative damage (MDA) and depleted antioxidants; carnosol treatment reversed these effects, similar to fluoxetine.
Effects of chronic stress on cognitive function – From neurobiology to intervention
A review concludes that chronic stress impairs cognitive flexibility, behavioral inhibition, and working memory, and these deficits are poorly treated by current therapies.
How COVID-19 Affects the Brain
A review reports that 20–70% of COVID-19 patients develop neuropsychiatric symptoms months after infection, driven by inflammation, microglial activation, and excitotoxicity.
From the Womb into the World: Protecting the Fetal Brain from Maternal Stress During Pregnancy
A policy-focused review states that maternal stress during pregnancy alters fetal brain wiring, increasing risk of neurodevelopmental disorders.
Investigating the effects of acute and chronic stress on DNA damage.
In house sparrows, chronic stress increased double-stranded DNA breaks across tissues, driven by the HPA axis rather than the sympathetic nervous system.
Preventive effect of peptides derived from fermented milk on chronic stress-induced brain damage and intestinal dysfunction in mice.
In mice, two peptides from fermented milk (Pep14 and Pep21) reduced anxiety-like behavior and neuroinflammation by regulating the HPA axis and gut-brain axis.