Study Notes – Chronic Stress & Anxiety

1. Stress Response (Recap)

• Triggered by hypothalamus → activates fight-or-flight in 3 waves:

  1. Neural response (milliseconds): ↑HR, airway dilation, ↑blood flow to muscles/brain.

  2. Adrenaline boost (≈30 sec): reinforces neural effects.

  3. Cortisol surge (minutes–hours): sustains response, preps for prolonged action.

• Acute stress (short-term): can sharpen focus, help performance.

• Chronic stress (long-term): damaging to multiple body systems.

• Anxiety + stress = “stress on steroids” → persistent alertness, amplifies physical effects.

2. Effects of Chronic Stress & Anxiety

a. Nervous System

• Cortisol → shrinks hippocampus → memory & learning problems.

• Anxiety → overactive amygdala → heightened fear/emotion.

• Outcomes: forgetfulness, brain fatigue, risk of anxiety/depression.

b. Endocrine System

• Adrenal glands: prolonged cortisol → insulin resistance (↑T2 diabetes risk).

• Thyroid suppression → ↓metabolism → fatigue.

• Reproductive hormones: women → irregular cycles; men → ↓testosterone.

• Vicious cycle: stress ↔ anxiety ↔ cortisol.

c. Cardiovascular System

• Adrenaline: ↑HR, ↑BP (short-term fine, chronic → hypertension).

• Cortisol/adrenaline: arterial damage → inflammation → plaque buildup → ↑risk of MI & stroke.

• Anxiety: chest pain, palpitations mimic heart disease → adds worry.

d. Digestive System

• Stress diverts blood away from gut → slows digestion.

• Effects: reflux, IBS, constipation, gut inflammation (↑ulcer risk, ↓nutrient absorption).

• Cortisol: ↑cravings for sugar → weight gain + ↑blood glucose.

e. Musculoskeletal System

• Muscle tension (neck, shoulders, jaw) → chronic pain, headaches, migraines.

• Anxiety worsens → jaw clenching, poor posture, constant fatigue.

f. Immune System

• Cortisol → ↓WBC count, ↓immune activity → ↑infections, slow wound healing.

• Chronic stress + anxiety → ↑autoimmune risk, ↑inflammation.

g. Sleep

• High nighttime cortisol → insomnia, restless sleep.

• Poor sleep worsens stress/anxiety → vicious cycle.

3. Coping & Management

a. Change Perception

• Stress often comes from “what if” scenarios (future worries that don’t happen).

• Different people perceive same stressor differently → train brain to see challenges as less threatening.

b. Exercise

• Burns excess cortisol.

• Boosts endorphins (improved mood).

• Protects heart & muscles.

• Ideal: mix of resistance + cardio (steady-state + intervals).

c. Unplugging from Media

• Take daily intentional breaks from phones, social media, and constant input.

• Helps reduce overstimulation, reconnect with self/nature.

d. Mindfulness Practices

• Meditation & deep breathing → activate parasympathetic system.

• Benefits: ↓HR, ↓BP, better mood & emotional regulation.

• Example: Box breathing (inhale–hold–exhale–hold, 3–4 sec each, repeat 3–5 min).

e. Sleep Hygiene

• Reduce late-night stressors & cortisol triggers.

• Use mindfulness (like breathing exercises) to wind down.

f. Professional Help

• Therapy and medication can be necessary for some individuals.

• Medication may be temporary or long-term depending on need.

4. Key Takeaways

• Chronic stress + anxiety → multi-system damage (brain, heart, gut, hormones, immunity).

• Main drivers: cortisol & adrenaline when elevated long-term.

• Healthy coping = perception shift, exercise, unplugging, mindfulness, gratitude, sleep, and sometimes professional support.

• The body is resilient and can recover with consistent care.