Can Stress Trigger Neurological Disorders?

Most people try to manage some sort of stress in their lives. It can be due to tight deadlines, financial pressure, relationship strain or health problems. It may be a bad week or a difficult phase of life that may pass. But what happens when it doesn't get managed? The brain pays the price of constant stress in the body.

There is growing research to learn the connection between chronic stress and neurological disorders. The findings are worth understanding to protect your health in the long run. 

What happens in the brain under stress?

The body activates the fight or flight response as soon as it senses a real or psychological threat. It engages the hypothalamic-pituitary-adrenal axis, or HPA axis, which releases stress hormones, cortisol and adrenaline. These hormones prepare your body to fight the perceived danger.

It is normal in short bursts, but the problem arises when the threat does not go away. Cortisol floods the brain continuously when the HPA axis stays active for weeks, months or years. This constant exposure can change the brain structure and function in irreversible ways.

The hippocampus is the main region to suffer from the chronic stress brain effects. It is responsible for the memory function. But stress can shrink this area over time. Another part to get affected is the prefrontal cortex, which is responsible for making decisions and regulating emotions. The amygdala processes fear and threat responses, but it also experiences the effects of stress. 

From stress to neurological damage — the mechanisms

Many other biological processes are also affected due to psychological stress.

Neuroinflammation 

Prolonged stress can lead to lasting neurobiological changes at the molecular and cellular levels that cause chronic inflammation in the central nervous system. This neuroinflammation damages neurons and disrupts normal brain signalling.

Oxidative stress

Oxidative stress has high metabolic rate and consumes oxygen, which deprives the brain and makes it vulnerable. It can damage proteins, lipids, and DNA within brain cells, and lead to stress-induced neurodegeneration. 

Cortisol toxicity

High cortisol may exert neurotoxic effects on the hippocampus and promote oxidative stress and amyloid-beta peptide toxicity. It is a hallmark of Alzheimer's disease.

Disrupted neuroplasticity 

Stress changes the brain's ability to form new neural connections, impairing memory, learning, and emotional resilience over time.

Which neurological conditions are linked to chronic stress?

The research points to many conditions where chronic stress may play a role or increase the progression of disease.

Alzheimer's disease and dementia

Chronic stress is closely associated with the progression of Alzheimer's disease due to the excessive production of cortisol in the HPA axis dysregulation and neuroinflammation in the central nervous system. The hippocampus is the most vulnerable which is critical to memory.

Epilepsy

Stress can increase seizure frequency by lowering the seizure threshold in people with epilepsy. It also destabilises the brain's electrical activity. Severe psychological stress, even in people without a prior diagnosis, has been associated with seizure-like episodes from stress.

Parkinson's disease

Research suggests that chronic stress may accelerate the progression of Parkinson's disease by aggravating neuroinflammation and oxidative stress in the brain, two processes that are already central to how Parkinson's develops and worsens over time.

Stroke

Stress can aggravate neurological dysfunction caused by stroke by raising blood pressure. It compromises the blood vessels supplying the brain due to inflammation. The risk of stroke is higher in people with constant stress.

Migraine and headache disorders

Stress is commonly reported with migraine, both during the period of active stress and in the "let-down" phase after it passes. A sudden drop in cortisol levels can precipitate an attack.

Who is at higher risk?

It is not necessary for everyone to develop a neurological condition due to chronic stress. Other factors, such as genetics, baseline health, and the nature and duration of the stress, also matter. However, some groups of people have a higher risk. 

• People with a family history of neurodegenerative diseases such as Alzheimer's or Parkinson's.
• Those with pre-existing neurological conditions, in whom stress can cause flare-ups.
• Individuals experiencing early or prolonged trauma in childhood, which can produce lasting changes in HPA axis function.
• Poorly managed anxiety or depression conditions are themselves stress-related and share neurobiological pathways with other neurological disorders.

What this means practically

Although stress and neurological disorders share biological pathways, it does not mean that every stressed person will develop a brain disease. But it does mean that stress management is a neurological concern.

Patients with neurological diseases and brain injuries are more vulnerable to experiencing the effects of stress. However, there is growing evidence that suggests that psychological interventions can help such people.

Another way to manage stress is by practising mindfulness, doing physical activity, getting enough sleep and professional help when needed. These steps may reduce cortisol brain damage and neuroinflammation.

Takeaways

Chronic stress may cause biological changes in the brain. The reason is high cortisol, neuroinflammation, and oxidative stress, which are associated with neurological disorders. It includes Alzheimer's disease, Parkinson's disease, epilepsy, stroke, and migraines. 

The effect of stress on the brain is higher if a person carries stress for a long time. Anyone experiencing psychological stress and who also has a family history of neurological disease should discuss neurological risk assessment with their doctor. They can help them get the right support to protect brain health.