Your heart is beating faster.
Your palms feel sweaty.
Your stomach feels strange.
You can feel your body becoming tense, and your mind is racing through everything that could go wrong.
But there is no physical danger. You are simply sitting in an examination hall. So why is your body reacting as if you are being chased?
The answer lies in one of the body's most powerful survival systems: the stress response.
Stress is something almost everyone experiences. Students can feel stressed about exams, deadlines, friendships, family problems, money, expectations and an uncertain future. Adults experience stress at work, at home and in relationships.
Stress is more than simply “feeling worried”. It involves a complex interaction between the brain, nervous system, hormones, thoughts, emotions and behaviour. In psychology, understanding stress means asking important questions: What causes stress?, What happens inside the body when we become stressed?, Why can some situations affect one person more strongly than another?, Can stress ever be useful?
And perhaps most importantly:
What happens when stress continues for too long?
In this article, we will explore the psychology and biology of stress, including the fight-or-flight response, the General Adaptation Syndrome, life events, daily hassles and ways of coping with stress.
What is stress?
Stress can be understood as a response that occurs when a person perceives that the demands placed on them are difficult to manage.
The important word here is perceives.
Two people can experience exactly the same situation but respond to it differently.
Imagine two students are told that they have an important exam next week.
One student thinks:
“I've prepared well. I'll do my best.”
Another thinks:
“I'm going to fail. I haven't done enough. Everything depends on this exam.”
The situation is similar.The psychological experience may be very different.
This shows why stress is not simply about what happens to us. It can also depend on how we interpret and respond to what happens.
What is a stressor?
A stressor is something that causes or contributes to a stress response.
Stressors can come from many different sources.
For a student, they might include: examinations, homework, deadlines, academic pressure, conflict with friends, family difficulties, financial concerns, lack of sleep, uncertainty about the future, pressure from social media and major changes in life.
A stressor does not necessarily have to be negative. Even positive events can require adjustment.
For example, moving to a new school might be exciting, but it can also create uncertainty and pressure.
Similarly, starting university or getting a new job may be positive experiences while still requiring significant adjustment.
This is one reason psychologists distinguish between the event itself and the person's response to it.
Is all stress bad?
Not necessarily. We often think of stress as something that should always be eliminated.But a certain amount of stress can actually be useful.
Imagine that you have an exam tomorrow. A small amount of pressure might motivate you to revise. You may become more alert and focused. Your body prepares you to respond to a challenge. This type of response can help you perform.
The problem is that stress can become harmful when it is too intense, lasts too long, or becomes difficult to manage.
This distinction is important. The goal is not necessarily to live a life with zero stress. Instead, psychologists are interested in understanding how people respond to stress and what happens when the stress response becomes prolonged.
The body's emergency system: fight or flight
One of the best-known psychological responses to stress is the fight-or-flight response.
Imagine walking through a dark street when you suddenly hear footsteps behind you.Your brain quickly evaluates the situatio and ask if there is danger. If your brain interprets the situation as threatening, your body can rapidly prepare itself for action.
Your heart rate increases. Your breathing becomes faster. Your muscles receive more blood. Your pupils may dilate. You become more alert. Your body is preparing to either: fight the threat or run away from it.
This is known as the fight-or-flight response.
The role of the sympathetic nervous system
The fight-or-flight response involves the sympathetic nervous system, which is part of the autonomic nervous system. The autonomic nervous system helps regulate processes that we do not normally have to consciously control, such as heart rate and digestion.
When we perceive a threat, the sympathetic nervous system becomes more active. This prepares the body for rapid action.
For example:
Heart rate increases
More blood can be delivered to muscles.
Breathing becomes faster
The body can take in more oxygen.
Pupils dilate
This can allow more light to enter the eyes and increase visual awareness.
Digestion is reduced
During an immediate threat, digestion is not the body's priority.
Muscles become ready for action
The body prepares to move quickly.
These changes are useful if you genuinely need to escape from danger but there is an interesting problem. Your body cannot always tell the difference between a physical threat and a psychological one.
That means the same stress response can occur before an important exam.
Adrenaline: the body's rapid-response hormone
The adrenal glands release adrenaline, also known as epinephrine, during the stress response. Adrenaline contributes to many of the physical changes associated with acute stress.
It helps increase heart rate and prepares the body for rapid action. This explains why you might experience: a racing heart, sweaty palms, rapid breathing, trembling, increased alertness and muscle tension.
These sensations can feel unpleasant, but they are part of a biological system designed to help the body respond to perceived danger.
Why does your heart race before an exam?
Consider an exam situation. You are sitting at your desk. The papers are placed face down. The teacher says:
“You may begin.”
Suddenly, your heart seems to speed up.
Your hands may become sweaty. You might feel nervous.
Why?
Your brain has interpreted the examination as a significant challenge. There is no tiger chasing you. There is no physical attack but your body does not need a physical threat to activate a stress response.
Psychological threats can be enough. The possibility of failure, embarrassment or disappointing someone can trigger powerful emotional and physiological responses.
The General Adaptation Syndrome
Psychologist Hans Selye proposed another important explanation of stress called the General Adaptation Syndrome (GAS).
Selye suggested that when the body experiences prolonged stress, it may pass through three stages: Alarm, Resistance and Exhaustion.
Let's look at each stage.
Stage 1: Alarm
The alarm stage is the body's immediate response to a stressor. The fight-or-flight response becomes activated. The Heart rate increases, adrenaline is released and the body becomes more alert.
Imagine a student discovering that they have an important exam tomorrow and haven't revised. The initial reaction might include panic, increased heart rate and intense alertness. The body has entered the alarm stage.
Stage 2: Resistance
If the stressor continues, the body moves into the resistance stage. The immediate alarm response may decrease, but the body remains activated as it attempts to cope with the ongoing stress.
Imagine that the student continues studying under pressure for several days.They may no longer feel the intense panic they experienced initially. Instead, they may simply feel constantly tense, tired and focused on dealing with the demands placed upon them.
The body is attempting to maintain functioning despite the continued stress.
Stage 3: Exhaustion
If stress continues for a long period and the body's resources become depleted, Selye proposed that the person can enter the exhaustion stage. At this point, prolonged stress may be associated with fatigue and reduced ability to cope.
This is why chronic stress can be problematic. The body was designed to respond to threats, not remain in a state of high activation indefinitely.
Acute stress vs chronic stress
It is useful to distinguish between acute stress and chronic stress.
Acute stress
Acute stress is short-term. It might occur before: an exam, a presentation, a driving test, an important match or an interview.Once the situation is over, the stress response can reduce.
Chronic stress
Chronic stress continues over a much longer period. For example, someone might experience ongoing financial problems, family conflict or persistent academic pressure.
The problem with chronic stress is that the body may repeatedly or continuously activate systems designed for short-term emergencies. This can have consequences for wellbeing and everyday functioning.
What causes stress?
Stressors can be broadly divided into different categories.
One useful distinction is between major life events and daily hassles.
Both can contribute to stress, but they operate in different ways.
Major life events
Major changes can require significant psychological and behavioural adjustment.
Examples include: moving house, starting a new school, losing a job, getting married, experiencing a relationship breakdown, serious financial difficulties or bereavement.
Even positive events can require adjustment. For example, having a baby can be a joyful experience while also creating major changes to sleep, routines, responsibilities and finances.
Psychologists have therefore investigated whether major life events can be associated with increased stress and illness.
Holmes and Rahe's research
Psychologists Thomas Holmes and Richard Rahe developed the Social Readjustment Rating Scale (SRRS).
They were interested in whether major life events were associated with illness. The scale assigned different values to life events according to the amount of adjustment they were believed to require.
Events were given different scores, and researchers could then calculate an individual's overall level of life-change stress.
The basic idea was straightforward: The more major changes a person experiences, the greater the potential demand for psychological and physical adjustment.
This research helped draw attention to the relationship between life events and stress.
However, it also has important limitations.
A limitation of life-event scales
One major problem is that people respond differently to the same event. Getting married might be extremely stressful for one person and relatively manageable for another.
Moving house could be exciting for one individual and frightening for someone else.
The scale therefore risks treating stress as though it is determined entirely by the event itself.
But as we have already seen: How a person interprets an event matters.
Another limitation is that the scale can treat positive and negative events in a similar way because both require adjustment.
This may oversimplify the psychological experience of stress.
Daily hassles: small problems that add up
Not all stress comes from dramatic life events. Sometimes it is the accumulation of small everyday problems. These are known as daily hassles.
Examples might include: missing the bus, losing your keys, having a difficult lesson; receiving a disappointing mark, arguing with a friend, having too much homework, waiting in a long queue, dealing with constant notifications, or struggling with technology.
One small inconvenience may not seem significant but imagine experiencing several of them every day. Over time, the accumulated effect may contribute to stress.
Kanner and daily hassles
Psychologists Kanner and colleagues investigated the relationship between daily hassles, life events and psychological wellbeing.
Their research suggested that everyday hassles could be important predictors of stress and wellbeing. This challenges the idea that major life events are always the most important sources of stress.
Sometimes it isn't one huge event.
It is the constant accumulation of smaller problems. Think about a student who has: slept badly, missed breakfast, missed the bus, forgotten their homework, received a poor test result, argued with a friend, and then discovered that they have another assignment due tomorrow.
None of these events individually has to be catastrophic.Together, however, they can create significant pressure.
Why do people respond differently to stress?
If two people experience the same stressor, why don't they always respond in exactly the same way?
There are many possible explanations. One important factor is individual differences.
People differ in: personality, previous experiences, coping strategies, social support, beliefs, expectations, physical health, sleep, confidence and how they interpret situations.
Consider two students who receive the same exam result.
Student A thinks:
“I didn't do well, but I know what I need to improve.”
Student B thinks:
“This proves I'm terrible at this subject. I'm never going to succeed.”
The event is identical but the interpretation is different. That interpretation can influence the person's emotional response.
Stress and the brain
Stress isn't just a physical response. The brain plays a central role in identifying and responding to potential threats.
A structure called the amygdala is involved in processing emotional information, including potential threats.When the brain detects danger, it can activate systems that prepare the body to respond.
Another important structure is the hypothalamus, which helps coordinate the body's response to stress. The hypothalamus can activate the autonomic nervous system and contribute to the release of stress hormones.
This is one reason stress should be understood as a whole-body response, rather than simply an emotion.
Cortisol and longer-term stress responses
Another important hormone associated with stress is cortisol. Cortisol is involved in the body's longer-term response to stress and helps regulate energy availability and other physiological processes.
In the short term, these responses can be useful.The body is preparing to deal with a challenge but prolonged activation of stress-related systems can be associated with negative effects on health and wellbeing.
This is why psychologists and health researchers are particularly interested in chronic stress.
Stress and exam performance
For students, one of the most important questions is: Can stress affect exam performance?
The answer is that the relationship can be complicated. A certain level of arousal may help someone feel alert, focused and motivated but excessive anxiety may make it harder to concentrate, retrieve information or think clearly.
Imagine sitting in an exam and becoming so worried about failing that you cannot focus on the question in front of you. You might actually know the material but the intense anxiety interferes with your ability to use what you know.
This is why managing exam stress is not about eliminating every feeling of nervousness. A moderate amount of pressure can be motivating. The goal however is to prevent stress from becoming overwhelming.
Coping with stress
If stress is part of everyday life, what can we do about it?
Psychologists distinguish between different approaches to coping. The two broad categories are problem-focused coping and emotion-focused coping.
Problem-focused coping
Problem-focused coping attempts to change or deal with the source of the stress.
Imagine you are stressed because you have three assignments due next week.
A problem-focused approach might involve:
1. listing the assignments;
2. identifying the deadlines;
3. breaking each assignment into smaller tasks;
4. creating a realistic schedule;
5. starting with the most urgent task.
The stressor hasn't disappeared but these are practical steps to manage it.
For students, this might mean: Don't simply tell yourself to “study more.” but rather: Decide what you need to study, when you will study it and how you will measure your progress.
Emotion-focused coping
Emotion-focused coping attempts to manage the emotional response to stress.
For example: talking to someone you trust, using relaxation techniques, exercising, taking a break, practising breathing exercises, engaging in enjoyable activities or using mindfulness techniques.
These approaches may not remove the stressor itself. However, they can help a person manage their emotional response.
Social support
One of the most important resources for coping with stress is social support. Talking to a trusted friend, parent, teacher, tutor or another supportive person can make a stressful situation feel more manageable.
Sometimes people make the mistake of believing that asking for help means they are weak. Psychologically, that isn't necessarily true. Seeking support can be an effective coping strategy. You don't always have to solve a difficult situation completely on your own.
Exercise and stress
Physical activity can also play a role in managing stress. Exercise can help regulate mood and provide a break from ongoing demands.
For a student, this could be as simple as: going for a walk, playing football, cycling, swimming, dancing, going to the gym or taking part in another physical activity they enjoy.
Regular movement can simply provide an opportunity to step away from academic pressure and engage the body.
Sleep and stress
Sleep is another important part of managing stress. When people are stressed, they may find it difficult to sleep. Unfortunately, poor sleep can then make it harder to concentrate, regulate emotions and cope with challenges.
This can create a cycle:
Stress → poor sleep → reduced coping → more stress
For students, staying awake all night to revise may therefore be counterproductive.Studying for longer does not automatically mean learning more.The brain needs rest.
Stress isn't always the enemy
It is tempting to think of stress as something that should never happen. But stress is a normal part of human life. Your body has evolved systems that allow you to respond quickly when something important or threatening happens.
The problem is not necessarily the existence of stress. The problem can be excessive or prolonged stress without sufficient recovery. Think about physical exercise. Training places stress on the body. Recovery allows the body to adapt.
Similarly, periods of challenge followed by adequate recovery may be manageable. Constant pressure without recovery can become much more difficult.
The importance of recognising stress
Learning about stress can help students recognise what is happening when their bodies and minds begin responding to pressure.
You might notice: a racing heart; tense muscles, difficulty concentrating, irritability, headaches, changes in sleep, feeling overwhelmed or constant worrying.
Recognising these signs does not automatically tell you what caused them but it can be a signal that something needs attention. If stress is persistent, severe or interfering significantly with everyday life, speaking with a trusted adult or appropriate health professional can be important.
Final thought
Stress is one of the clearest examples of the connection between the mind and the body.
A thought can make your heart race.
A deadline can make your muscles tense.
An exam can trigger a biological response designed to protect you from danger.
And a small problem that seems insignificant on its own can become much more difficult when combined with dozens of other daily pressures.
Psychology helps us understand why.
From the fight-or-flight response to Selye's General Adaptation Syndrome, and from major life events to everyday hassles, researchers have shown that stress is a complex process involving both our environment and our response to it.
The most important lesson isn't that stress is always bad.
It is that understanding stress gives us a better chance of recognising it, responding to it and managing the demands that cause it.
Quick GCSE Revision Checklist
Before your exam, make sure you can explain:
☐ What stress is
☐ What a stressor is
☐ The fight-or-flight response
☐ The role of the sympathetic nervous system
☐ The role of adrenaline
☐ The role of cortisol
☐ Acute vs chronic stress
☐ Selye's General Adaptation Syndrome
☐ The alarm stage
☐ The resistance stage
☐ The exhaustion stage
☐ Major life events
☐ Holmes and Rahe's research
☐ Daily hassles
☐ Kanner et al.'s research
☐ Individual differences in stress responses
☐ Problem-focused coping
☐ Emotion-focused coping
☐ The role of social support
☐ How stress can affect students and exam performance