How chronic stress affects brain health and what you can do

Category: Neuroscience, Stress Management, Brain & Spine Care
Posted on: Aug 3, 2026

Chronic stress can change how the brain works by prioritizing the “fight-or-flight” function and deprioritizing memory and other cognitive functions.

Key takeaways

Acute stress is a natural, protective reaction to a threat, but chronic stress lasts several weeks without letting up.
Chronic stress can physically and chemically change the brain, affecting sleep, concentration, memory, mood, anxiety and depression, and risk of neurodegenerative disorders.
Regular check-ins with yourself can help you recognize when you’re under long-term stress, so you can find ways to remove stressors or talk to a professional.

If you’ve ever driven on the Pontchartrain Expressway at rush hour or watched the Saints make a comeback in the second half, you’ve probably experienced stress. Your palms may sweat, your heart rate goes up, and you might even clench your jaw.

Occasional stress is pretty common and usually no cause for concern. But ongoing or chronic stress can physically change your brain, leading to memory fog, trouble sleeping, and other signs telling you that your body needs to slow down.

Learn what stress does to the brain and how to reset.

What happens to your brain when you’re stressed?

Biologically speaking, stress is one way we protect ourselves from danger. During a stressful situation, our body and brain respond.

Scientists think that in times of stress, the amygdala is super engaged. The amygdala is the “fight or flight” part of our brain. It signals the body to release hormones, such as adrenaline and cortisol, which keep you alert.

Because so much energy goes to the amygdala, there are less resources available to help other parts of your brain. That’s why it can be hard to remember things or complete basic tasks when you’re stressed.

Acute stress vs. chronic stress

“Normal” stress, or acute stress, happens when a specific event causes a temporary reaction. For example, running late for work. Typically, acute stress goes away, and you recover.

Chronic stress is long-term. You may feel a constant pressure that doesn’t let up. Common causes of chronic stress often relate to finances, employment, relationships, or health.

How does chronic stress change your brain?

Though protective in nature, stress isn’t easy on the brain. And chronic stress can change how the brain works altogether.

You can think of it like building muscle. The more you work certain muscles, the larger and more functional they become. With the brain under constant stress, it uses the amygdala more and other parts of the brain less. So, the threat part of the brain gets bigger, and the parts that handle other types of thinking get smaller.

Chronic stress can:

Lead to poor sleep, which affects your ability to pay attention
Make it harder to remember and concentrate
Cause severe mood swings with intense emotions
Increase your risk of anxiety, post-traumatic stress disorder (PTSD), and depression
Result in earlier cognitive decline, Alzheimer’s disease, Parkinson’s disease, and other neurodegenerative disorders

Common signs of chronic stress

Everyone experiences stress differently. You may have chronic stress if you have three or more of these symptoms, and they last for several weeks:

Sleep issues or insomnia
Changes in productivity
Changes in how you socialize, or withdrawal from others
Little to no energy
Inability to focus or think clearly
Changes in appetite
Increased drug and alcohol usage
Racing thoughts
Strong feelings of worry, anxiety, or nervousness that don’t go away
Increased irritability
Headaches or body pain

Brain-friendly ways to reduce stress

If you’re often stressed, here are some tips to support your mental health.

Check in with yourself regularly

Stress shouldn’t be the norm. It can help to step back and check in with your stress levels each day. What does stress feel like for you? How do you feel right now? Do you always feel under stress?

Establish a healthy routine

A consistent, predictable routine each day can help reduce stress levels—and make it easier to focus on your health. Try to go to sleep and wake up at around the same times each day and go to bed early enough to get quality sleep. Most adults need between seven and nine hours of sleep each night for optimal health.

Eat whole foods when you can, and drink plenty of water. And try moving your body at least 30 minutes a day to improve your mood.

Take moments to yourself

It’s important to find activities that relax you and make time for them. Some options include:

Meditating
Practicing mindfulness
Deep breathing
Doing yoga
Exercising
Learning a new hobby
Having quiet time
Turning off all screens
Listening to your favorite music
Taking a hot bath

Find social connection

Just talking to another person can lower stress levels and bring a new perspective to issues that may be bothering you. Try to schedule regular time with family, friends, or meet-up groups to connect with new people.

You can also talk with a therapist, who can provide additional professional support.

When to seek professional help for stress

It may be time to talk to a professional about stress if symptoms:

Are always present
Last more than a few weeks
Interfere with work, school, your relationships, or daily life
Cause you to avoid doing activities, especially ones you enjoy

At LCMC Health, your primary care provider is a great place to start. They can refer you to a mental health specialist or the Neuroscience Institute to address any brain-related changes.

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