Stress generally refers to two things: the psychological perception of pressure, on the one hand, and the body's response to it, on the other, which involves multiple systems, from metabolism to muscles to memory. The response to stress is not just widespread, affecting almost all systems of the body and brain, but it is automatic, triggered by any perceived threat or demand that exceeds a person's ability to cope.
The automatic response system set off by the perception of threat is activated through hormonal signals. It is designed to instantly prepare an animal to meet a threat head-on or to flee from it—the fight-or-flight response..
Some stress is necessary for all living systems; it is the means by which they encounter and respond to the challenges and uncertainties of existence. Short-term, moderate doses of stress increase alertness, boost immunity, and spur brain growth.
What Causes Stress?
The perception of threat—whether it’s the sudden appearance of a snake on the path or the fear of losing your job when the boss yells—triggers a cascade of hormones, including adrenaline (epinephrine), noradrenaline (norepinephrine), and cortisol, that surge through the body.
The hormones increase heartbeat and the circulation of blood to support quick action, mobilize fat and sugar for immediate energy, focus attention to track the danger, prepare muscles for movement, and more.
This response was meant to be lifesaving under the condition in which early humans evolved. It solves short-term, life-threatening problems, such as the sudden appearance of a tiger. It was not meant for the extended difficulties of modern life, such as daily traffic jams and marital problems, to name just a few of the many challenges that can activate the stress response. The physiologic changes that underlies the potentially lifesaving fight-or-flight response are, if sustained, harmful to many systems of the body.
Many people today feel they perpetually struggle with stress and anxiety, a sense of apprehension that persists even after a stressor is gone. Society’s obsession with productivity, the steady stream of digital information we consume, increasingly sedentary lifestyles, and feelings of overwhelm may contribute to the stress that so many are feeling.
Chronic stress is the sustained exposure to a threatening situation. It can emerge in the absence of a severe or acute incident. An array of factors, including a disrupted sleep schedule, feeling perpetually undervalued or overwhelmed at work, and not having close relationships with friends or family members can all independently contribute to chronic stress.
The signs of stress include insomnia, stomachaches, headaches, muscle tension, a racing heartbeat, and trouble concentrating, among others. Signs of burnout, a concept distinct from stress, include emotional exhaustion, cynicism and depersonalization, and reduced personal efficacy.
How to Manage Stress
There are both physical and psychological approaches to blunt stress. Physical steps include meditation, yoga, and exercise. Psychological strategies include leaning on loved ones or, in more severe cases, seeing a mental health professional.
Since the stress response begins in the brain with the perception of danger or the unknown, researchers now believe that the most basic, and likely most effective, way to diffuse stress is to change the perception of certain situations so that they are not seen as threatening in the first place.
Studies show that helping people see certain experiences—such as final exams—as demanding rather than dire protects them from the corrosive effects of stress while still delivering its positive effects, such as focused attention and speedier information processing. Changing the stress mindset not only minimizes the harms of stress, studies show, but it also enhances performance and productivity.
Plan and organize your time, reflect on your values and strengths, and practice relaxation techniques such as deep breathing. Additionally, reframe negative thoughts about a situation to neutral or positive thoughts so that you can see the full picture. Research shows that these strategies and others can successfully curb stress.
There are both healthy and unhealthy responses to stress. Unhealthy responses can include turning to alcohol, drugs, or gambling. Healthy coping strategies include meditation, exercise, journaling, practicing gratitude, and trying to let go of what is beyond our control.
In a 2024 Global Workplace Report, the Gallup organization found that 41 percent of workers worldwide experience high levels of stress on a daily basis—and the primary cause is poor management practices. You likely can't change your boss; nevertheless, there are steps to take. Instead of fixating on an overwhelming worry or responsibility, change the way you appraise the situation—your perspective may be a big contributor to stress. Check whether you are subscribing to cognitive distortions such as catastrophizing or all-or-nothing thinking. In addition, be specific about the tasks that need to be completed. Break each one down into small, manageable parts, and then focus on one at a time rather than trying to multitask. Such actions can help bring work stress under control.
How Stress Affects Your Health
Short bursts of stress aren’t inherently harmful, although it can take time for the body to calm down. Yet prolonged or repeated arousal of the stress response can have harmful physical and psychological consequences. The repercussions include ailments from heart disease and diabetes to anxiety and depression.
Over time, prolonged stress can lead to changes in many systems of the body. It can activate inflammatory pathways and promote many of the disorders associated with aging. Persistent stress can lead to compromised cardiac function and gastrointestinal issues, to say nothing of depression and anxiety.
Ongoing stress assaults the immune system, making us more vulnerable to disease. Although stress hormones ready the body for emergencies, the immediate effects on the immune system prove deleterious when they are sustained over a long period of time. Prolonged production of the stress hormone cortisol suppresses immune cell production and creates chronic, low-grade inflammation. There is a reduction in natural killer cells and lymphocytes, increasing susceptibility to viruses and infections and delaying recovery.
Stress hormones, such as cortisol, are naturally produced every day so that people can take on the challenges ahead. But marinating in high levels of stress hormones over time is a brain changer. Most notoriously, sustained stress assaults the hippocampus, essential for memory. Memory impairment, cognitive difficulties, anxiety, and depression are just a few of the brain consequences of prolonged stress..