Stress is a natural part of life, but when does it shift from a temporary challenge to a long-term burden on our bodies, specifically as it concerns brain health? The key differences between stress and chronic stress lie in their duration, intensity, and overall impact on well-being.<\/p>\n
\u201cAcute stress is typically short-term, triggered by a specific event or situation,\u201d explained Amy Knight, Ph.D., associate professor in the UAB Department of Neurology. \u201cIt causes a temporary reaction that subsides once the stressor is resolved, allowing the body to recover and return to a balanced state. Chronic stress, on the other hand, arises when a persistent stressor lingers for an extended period with few opportunities for resolution. This can stem from financial hardship, work-related issues, relationship conflicts, or medical conditions.\u201d<\/p>\n
In a state of chronic stress, returning to a balanced state of rest and relaxation becomes much more challenging. Chronicity depends on the frequency and duration of stress, with the potential for the body to remain in a state of chronic inflammation. Stress-induced inflammation can lead to long-term health problems, including its effects on healthy brain functioning.<\/p>\n
Knight explains the various ways chronic stress can affect our bodies, including brain health.<\/em><\/p>\n Chronic stress can lead to brain inflammation<\/strong><\/p>\n Inflammation arises when the immune system is activated. In the brain, microglia carry out this function, working to maintain balance and respond to threats or injury.<\/p>\n \u201cIn a normal brain, inflammation may occur in reaction to a viral infection, pathogen exposure, or to aid in recovery after tissue damage from a traumatic brain injury,\u201d Knight said. \u201cAcute inflammation typically resolves over time, but it may persist for various reasons. Stress can slow down the recovery process.\u201d<\/p>\n Persistent inflammation in a time of stress may have evolved as a protective mechanism. According to Knight, \u201cIn a dangerous world with physical threats, the anticipation of harm may have been helpful for recovery. However, in a world of perceived threats, stress from work or school, financial strain, relationship drama \u2013 the stress response system is generally excessive considering the absence of an objective physical threat.\u201d<\/p>\n Long-term effects of stress on memory and learning<\/strong><\/p>\n In a stressful situation, the brain reacts as if there was a physical attack on the body and activates the \u201cfight or flight\u201d response. This ancient survival mechanism triggers the hypothalamic-pituitary-adrenal (HPA) axis to cause physiological changes in the body through the release of stress hormones, cortisol, and adrenaline.<\/p>\n \u201cThe purpose of this physical change is to prepare for immediate action by increasing heart rate and energy levels,\u201d Knight explained. \u201cThis can be helpful in fighting off a bear attack or, in modern times, surviving a car accident. However, prolonged stress can lead to persistent inflammation, which takes a significant toll on the body.\u201d<\/p>\n Stress hormones encourage pro-inflammatory cytokines, which can lead to an overactive immune response. In addition, chronic inflammation can increase arterial plaques, damaging blood vessels and increasing the risk of heart attacks and strokes.<\/p>\n Biological markers linked to stress-induced inflammation<\/strong><\/p>\n Specific biological markers, such as C-reactive protein (CRP), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-\u03b1), are associated with stress-induced inflammation. These markers play a critical role in understanding how stress affects the body on a molecular level.<\/p>\n \u201cBlood tests that measure these inflammatory markers, along with stress hormones like cortisol, provide valuable insights into the overall stress burden on the body,\u201d Knight explained.<\/p>\n By analyzing these biomarkers, healthcare providers can assess the severity and potential long-term impacts of stress on an individual\u2019s physical health, particularly in relation to immune function and disease susceptibility.<\/p>\n The role of stress in neurodegenerative diseases<\/strong><\/p>\n Chronic inflammation caused by stress is believed to play a significant role in the early development of neurodegenerative conditions such as Alzheimer\u2019s and Parkinson\u2019s disease. This persistent inflammatory state works as an accelerator to weaken neural circuitry and lower the threshold at which these diseases can manifest.<\/p>\n \u201cOver time, chronic inflammation contributes to a faster breakdown of brain function, essentially speeding up the aging process and leading to an earlier onset of cognitive decline,\u201d Knight said. \u201cThe prolonged stress response, with its sustained inflammatory impact, may thus set the stage for these devastating diseases to appear prematurely.\u201d<\/p>\n Chronic stress affects sleep<\/strong><\/p>\n A stressed brain may have trouble sleeping related to anxiety and feeling revved up, sometimes with racing thoughts that keep us up at night.<\/p>\n \u201cEnvironmental factors like blue light from a TV or a phone screen can interfere with the normal sleep cycles and delay sleep onset,\u201d Knight explained. \u201cDifficulties with maintaining sleep may be related to eating sugary food or drinking alcohol before bed. Insufficient sleep can impact the regulation of the immune system and lower resilience to stress and inflammation.\u201d<\/p>\n Chronic stress affects emotions and decision-making<\/strong><\/p>\n Prolonged stress can take a toll physically, cognitively, and emotionally. People may experience multiple physical ailments, including headaches, stomach and GI distress, muscle aches, joint pain, sleep disturbances, and daily fatigue.<\/p>\n \u201cCognitive symptoms are often described as \u2018brain fog\u2019 and typically described as forgetfulness, difficulty concentrating, and slowing,\u201d Knight explained. \u201cMood changes may also occur with increased anxiety, irritability, or feeling down and depressed. Inflammation can alter hormones and neurotransmitters, which can lead to mood swings.\u201d<\/p>\n Written by: Teresa Hick<\/p>\nTo learn more about stress and stress-related issues, go to stress.org.<\/a><\/h5>\n