Welcome to the Psychology of Stress!
Hello! Today, we are diving into one of the most relatable topics in Psychology: Stress. We all feel "stressed" sometimes—whether it’s before an exam, after an argument, or when we have too much to do. But in Psychology, we look deeper. We want to know exactly what happens in the body, why some people handle it better than others, and how we can manage it.
Don't worry if some of the biological terms seem a bit "science-heavy" at first. We will break them down into simple steps with plenty of examples. By the end of these notes, you’ll be an expert on how the human body and mind react to the pressures of life!
1. The Physiology of Stress: What Happens Inside?
When you encounter a stressor (something that causes stress), your body has two main "alarm systems" that kick into gear. Think of it like a house alarm: one part reacts instantly to a break-in, while the other part keeps the security company updated over a longer period.
The SAM Pathway (Short-term Stress)
The Sympathomedullary (SAM) pathway is your "Fight or Flight" response. It happens in seconds!
1. The brain identifies a threat.
2. The hypothalamus stimulates the adrenal medulla (the middle part of the adrenal glands).
3. The adrenal medulla releases adrenaline and noradrenaline into the bloodstream.
4. This increases your heart rate and blood pressure, getting you ready to run away or stay and fight.
The HPA System (Long-term Stress)
If the stress continues (like worrying about exams for weeks), the Hypothalamic-Pituitary-Adrenal (HPA) system takes over.
1. The hypothalamus releases a hormone called CRH.
2. This triggers the pituitary gland to release a hormone called ACTH.
3. ACTH travels to the adrenal cortex (the outer layer of the adrenal glands), which releases cortisol.
4. Cortisol provides a burst of energy but, if it stays high for too long, it can suppress your immune system.
General Adaptation Syndrome (GAS)
Hans Selye proposed that our bodies react to stress in three universal stages. A good way to remember this is the acronym A.R.E.:
• Alarm Reaction: The initial shock and the "fight or flight" response kicks in.
• Resistance: The body tries to adapt to the stressor. You might feel "okay," but your resources are being used up.
• Exhaustion: If the stress continues, the body runs out of resources. This is when you get sick.
Quick Review: SAM is for fast, "scary dog" stress (Adrenaline). HPA is for slow, "exam week" stress (Cortisol). GAS is the three-stage journey from alarm to exhaustion.
2. Stress and Illness
Have you ever noticed that people often get a cold right after a stressful period? There is a biological reason for this!
Immunosuppression
The immune system protects us from viruses and bacteria. However, when we are stressed, high levels of cortisol actually stop the immune system from working properly. This is called immunosuppression. Effectively, your body is so busy dealing with the stress that it forgets to fight off the common cold!
Cardiovascular Disorders (CVD)
Stress also affects the heart. Repeated activation of the SAM pathway causes high blood pressure, which can damage the lining of blood vessels. This makes cardiovascular disorders, like heart disease or strokes, more likely over time.
Key Takeaway: Stress doesn't just feel bad; it physically weakens our ability to fight germs and puts extra pressure on our hearts.
3. Sources of Stress: Where Does It Come From?
Psychologists look at three main sources of stress in everyday life.
Life Changes
These are big, infrequent events that require a person to make a major adjustment to their life. Examples include moving house, getting married, or a death in the family. Psychologists Holmes and Rahe developed the SRRS (Social Readjustment Ratings Scale) to measure these using "Life Change Units" (LCU).
Daily Hassles
Some psychologists argue that "the little things" matter more. Daily hassles are minor, everyday annoyances like losing your keys, traffic jams, or a slow internet connection. While they seem small, they can "pile up" (the accumulation effect) and cause more stress than one big life change.
Workplace Stress
We spend a lot of time at work or school. Two main factors cause stress here:
1. Workload: Having too much to do in too little time.
2. Control: This is the most important part! People who have low control over their jobs (they are told exactly what to do and when) tend to be much more stressed than those with high control.
Did you know? The "Whitehall Study" found that lower-grade civil servants (who had less control over their work) had higher rates of heart disease than their bosses!
4. Measuring Stress
How do we put a number on stress? We use two main methods.
Self-Report Scales
• SRRS (Social Readjustment Ratings Scale): A list of 43 life events. You check which ones happened to you in the last year and add up the "Life Change Units."
• Hassles and Uplifts Scale: This measures the small negative things (hassles) and the small positive things (uplifts, like a nice cup of coffee) that happen in a day.
Physiological Measures
• Skin Conductance Response (SCR): When you are stressed, you sweat slightly (even if you can't feel it). Sweat conducts electricity. By placing sensors on the skin, researchers can measure how much you are sweating to see how stressed you are. This is a more "objective" way to measure stress because you can't lie about your sweat levels!
Common Mistake: Don't assume self-reports are always best. People might forget things or "socially desire" to look less stressed. SCR is more accurate but only measures immediate stress, not long-term worry.
5. Individual Differences: Why Are We Different?
Not everyone reacts to stress the same way. Some people "thrive" under pressure, while others find it overwhelming.
Personality Types
• Type A: Competitive, time-urgent, and aggressive. These people are more prone to stress-related heart disease.
• Type B: Relaxed, patient, and easy-going. They have a lower risk of stress-related illness.
• Type C: People-pleasers who suppress their emotions (especially anger). Some research links this to a higher risk of cancer, though this is debated.
Hardiness
Some people are naturally "hardy." Hardiness is a personality style that protects you from stress. It has three parts (The 3 Cs):
1. Commitment: Getting involved and having a sense of purpose.
2. Challenge: Seeing problems as opportunities to grow, not threats.
3. Control: Believing that you are in charge of your own life.
Memory Aid: Think of a hardy plant. It survives because it has strong roots (Commitment), stands up to the wind (Challenge), and grows where it wants (Control)!
6. Managing and Coping with Stress
So, how do we fix it? There are biological and psychological ways to manage stress.
Drug Therapy
• Benzodiazepines (BZs): These slow down the central nervous system by increasing the effect of a chemical called GABA. It’s like a "brake" for your brain.
• Beta-blockers: These work on the SAM pathway. They block adrenaline receptors in the heart, keeping your heart rate and blood pressure low. They treat the physical symptoms of stress.
Psychological Therapies
• Stress Inoculation Therapy (SIT): This is like a "vaccine" for stress. You learn to handle small amounts of stress in a therapist's office so you are "immune" to it in the real world. You learn to change how you think about stress.
• Biofeedback: A person is hooked up to a machine (like an SCR monitor) that shows their heart rate or muscle tension. By watching the monitor, the person learns to consciously control their "unconscious" body functions by relaxing.
Social Support
Having friends and family helps. There are three types:
1. Instrumental support: Practical help (e.g., lending you money or driving you to an exam).
2. Emotional support: Giving you a "shoulder to cry on" and making you feel better.
3. Esteem support: Boosting your confidence so you feel you can handle the stressor.
Gender Differences
Generally, men are more likely to use problem-focused coping (fixing the issue), while women are more likely to use emotion-focused coping (talking about feelings). Evolutionarily, men may have used "Fight or Flight," while women used "Tend and Befriend" (protecting offspring and seeking help from the group).
Key Takeaway: Managing stress can be biological (pills), psychological (changing thoughts), or social (talking to friends). No single way is "best" for everyone!
Quick Summary Box
• Biology: SAM (fast) and HPA (slow) systems release adrenaline and cortisol.
• Illness: Stress can lead to immunosuppression and heart disease.
• Sources: Life changes, daily hassles, and low workplace control are big stressors.
• Personalities: Type A and "Hardiness" determine how we handle pressure.
• Coping: Options include drugs, SIT therapy, and social support.