Scientists discover that months of chronic stress can reduce the volume of the prefrontal cortex and hippocampus, affecting memory, decisions, and emotional control.

Written by Noel Budeguer

Published on 27/04/2026 at 13:54

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Recent research indicates that prolonged stress can cause profound changes in the brain, going far beyond mental fatigue. Continuous exposure to cortisol would be linked to alterations in essential areas for remembering, thinking clearly, controlling impulses, and dealing with emotions in daily life.

Chronic stress is no longer seen merely as fatigue, irritability, or an accumulation of problems. Recent research indicates that when pressure lasts for months, it may be linked to physical changes in important areas of the brain.

The most alarming point is that these changes occur precisely in regions related to memory, self-control, decision-making, and emotional regulation.

Cortisol has become the focus of investigation

One of the protagonists in this story is cortisol, known as the stress hormone. It is essential for the body to react to threats, but it can become a problem when it remains elevated for long periods.

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The hippocampus may be one of the first victims

The hippocampus is a small but vital structure. It is involved in the formation of memories, learning, and organizing important information for daily life.

When this region undergoes changes, a person may find it more difficult to remember, learn, concentrate, or organize thoughts. This is why prolonged stress is often associated with the so-called “mental fog.”

Another study, published in Scientific Reports, analyzed magnetic resonance imaging data from the UK Biobank in a subsample of 720 participants and assessed the hippocampus, amygdala, and thalamus.

Dose-response relationship between memory performance and cortisol levels. The first part of the graph shows that memory performance increases as cortisol levels rise, due to the activation of mineralocorticoid receptors, or MRs. When the MRs become saturated, further increases in cortisol levels activate glucocorticoid receptors, or GRs, and memory performance declines. Adapted with permission from Lupien et al.

The prefrontal cortex enters the danger zone

The prefrontal cortex is considered a kind of “command center” of the brain. It helps plan, control impulses, make decisions, maintain focus, and regulate emotions.

A review published in the journal Molecular Neurobiology, authored by Bingyu Ren, Quan Yuan, Shuhan Cha, Sinyi Liu, Jifeng Zhang, and Guoqing Guo, described this region as vulnerable to chronic stress.

According to the authors, prolonged stress can provoke negative neuroplasticity in this area, including dendritic atrophy, loss of synaptic spines, and changes in neuronal connectivity.

The brain does not just “feel” stress

The phrase “stress shrinks the brain” may sound sensationalist, but it summarizes a real concern of modern neuroscience. What studies show is not simply a feeling of mental weariness.

Science points to structural changes, alterations in connections between neurons, and possible reductions in volume in specific areas. In other words, stress can leave marks on the organ that controls practically everything we do.

A review published in Brain Research also highlighted that chronic stress profoundly affects the structure and function of the prefrontal cortex, especially the medial region.

Impact of chronic stress on major areas of the brain: prolonged increases in glucocorticoids affect the prefrontal cortex, amygdala, and hippocampus, causing cellular changes and impairments in functions such as attention, memory, decision-making, and emotional regulation.

Not everyone will be affected in the same way

Despite the warning, scientists do not claim that everyone will experience brain shrinkage in the same way. The effects depend on factors such as age, duration of stress, life history, sleep, mental health, and hormonal levels.

This means that the discovery is serious, but needs to be interpreted with caution: chronic stress is a risk factor, not an inevitable sentence.

When the body lives in survival mode

The problem begins when the body starts functioning as if it were constantly under threat. Cortisol remains high, sleep worsens, irritability increases, and the brain operates in a constant state of alert.

Over time, simple decisions can seem difficult. Patience decreases. Memory fails. Emotional control becomes more fragile. What seemed like just a “bad phase” can be a sign of deep overload.

This is the point that most concerns experts: many people normalize daily stress without realizing that the brain may be silently paying the price.

The discovery changes how we view stress

Chronic stress should not be treated as weakness, drama, or lack of discipline. It is a powerful biological response, capable of affecting hormones, behavior, and brain structures.

The good news is that the brain has plasticity. Adequate sleep, physical activity, reduced overload, social support, therapy, and medical care can help lessen the impact of prolonged stress.

The final message from science is direct: living under constant pressure doesn’t just affect mood. It can alter brain regions that help you remember, decide, control emotions, and persevere.

Scientists discover that months of chronic stress can reduce the volume of the prefrontal cortex and hippocampus, affecting memory, decisions, and emotional control.

Cortisol has become the focus of investigation

The hippocampus may be one of the first victims

The prefrontal cortex enters the danger zone

The brain does not just “feel” stress

Not everyone will be affected in the same way

When the body lives in survival mode

The discovery changes how we view stress

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Scientists discover that months of chronic stress can reduce the volume of the prefrontal cortex and hippocampus, affecting memory, decisions, and emotional control.

Cortisol has become the focus of investigation

The hippocampus may be one of the first victims

The prefrontal cortex enters the danger zone

The brain does not just “feel” stress

Not everyone will be affected in the same way

When the body lives in survival mode

The discovery changes how we view stress

The Soviet Union spent 22 years drilling into the Earth’s crust and reached a depth of 12,262 meters — they found water where it was thought impossible, hydrogen bubbling from the rock, granite that is 2.7 billion years old, and temperatures of 180 degrees that melted the drill bits.

Norway is drilling 27 kilometers of rock 392 meters below the bottom of a fjord to build the world’s largest and deepest underwater road tunnel — when completed, a 21-hour journey will be reduced to 10.

Chinese engineers begin filling a 217-meter dam at an altitude of 3,000 meters and prepare a 2,240 MW hydroelectric power plant to integrate hydropower, solar, and wind energy in the upper Jinsha.

A German architect built a cylindrical house in 1994 that rotates to follow the sun throughout the day, generates 5 times more energy than it consumes, and was the world’s first energy-positive house.

An astronaut spent 340 days in space while his twin brother stayed on Earth, and NASA found a “rejuvenating” effect, genes, microbiome, cognition, and immune system that revealed the biological cost of living outside the planet.

The island that has 35 inhabitants and celebrates Christmas on January 6: the remote island of Foula lives in isolation, without internet and following Julius Caesar’s calendar for centuries.

Scientists from the United Kingdom transform wool into a sustainable biomaterial for bone regeneration, test keratin in human cells and live animals, and show that the material creates bone that is more organized, stable, and natural-looking than traditional alternatives.

With the Arctic warming up to 4 times faster and signs of weakening in the Atlantic circulation, scientists warn that the system that keeps Portugal, Spain, France, and the United Kingdom milder could change as the planet continues to warm.

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