Chronic inflammation and mental health
Inflammation is a widely discussed process and is often referred to as a harmful and unnecessary reaction that must be reduced. However, in reality, inflammation is a natural and necessary mechanism of the body — it is the immune system's way of providing protection and repair.
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The problem arises when inflammation becomes chronic. Chronic, low-grade inflammation is linked not only to physical health but also to mental well-being. Studies show that it plays a significant role in the development of depression.
What is inflammation?
Inflammation is the body's defense system—the way the immune system responds to injury, infection, or threat. Acute inflammation is vital: It protects the body and helps it heal. But when inflammation becomes chronic, it can become a problem.
Acute and chronic inflammation
Acute inflammation is a short-term response to a problem. It lasts for hours or days and goes away as healing begins. Examples include redness, swelling, pain, or fever in the affected area during an infection.
Chronic inflammation occurs when the immune system remains activated for weeks, months, or years. It is characterized by low intensity, without pronounced symptoms, and affects many systems of the body. Its causes include: prolonged stress, poor sleep, unbalanced nutrition, intestinal diseases, lack of physical activity, chronic diseases, and environmental factors.
Inflammation and mental health
Evidence shows that chronic inflammation is linked to depression, anxiety, and bipolar disorder. People who live with chronic inflammatory conditions are more likely to experience mental health difficulties.
This interaction is two-way:
- Mental problems with prolonged stress cause inflammation.
- Chronic inflammation alters brain function and worsens mental health.
How does inflammation affect the brain?
Inflammatory cytokines affect brain structures. One of the main targets is the amygdala, the center of emotional response. Its chronic activation is associated with anxiety and exaggerated stress responses.
Increased cytokines (IL-6, IL-1β) and excessive amygdala activity provide the biological basis for anxiety disorders.
Chronic inflammation:
- Alters neurotransmitters (serotonin, dopamine), which affects mood and motivation.
- Activates the stress system and increases cortisol levels.
- It reduces brain plasticity, which reduces memory and emotional resilience.
- It makes it difficult to feel motivated and enjoy pleasure, which are characteristic symptoms of depression.
These changes result in: constant lethargy, fatigue, decreased concentration, lack of motivation, and social isolation.
"Illness response" and depression
When you have a cold or the flu, you often feel tired, withdrawn, and have a loss of interest. This is known as the “illness response”—a temporary behavioral change caused by inflammation.
When inflammation becomes chronic, this reaction is constantly active and symptoms similar to depression develop: lack of energy, apathy, and decreased concentration.
Gut, brain and immune system
Much of immune activity occurs in the gut. The gut microbiome helps balance the immune response, reduce chronic inflammation, and produce mediators that support brain health.
Factors contributing to chronic inflammation
- Stress – prolonged “fight or flight” wears out the body and exacerbates symptoms of depression.
- Insufficient sleep – even a few sleepless nights increase inflammatory responses.
- Processed foods – refined sugars, fats, and emulsifiers cause oxidative stress and cytokine activation.
- Lack of physical activity – myokines produced during movement have an anti-inflammatory effect.
How to reduce inflammation?
Chronic inflammation can be reduced in several ways: stress management, reducing sugar consumption, quitting tobacco and alcohol, and regular physical activity.
conclusion
Chronic inflammation and mental health are closely linked. They form a “vicious cycle” where inflammation worsens mental health, and mental health problems exacerbate inflammation. It can be managed with lifestyle changes and, if necessary, medication, only under the supervision of a doctor.
Resources
https://www.ypmh.org/inflammation-and-mental-health/
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