Study Notes: Chronic Stress & Anxiety

1. Stress Response Recap

• Three waves of stress response (fight-or-flight):

  1. Sympathetic nervous system (instant): ↑ HR, vasoconstriction, blood shunted to brain/muscles, ↑ airway opening, sweat.

  2. Adrenaline (≈30s later): Secreted by adrenal medulla; reinforces sympathetic effects.

  3. Cortisol (minutes–hours): Sustains stress response, preps body for prolonged action.

• Short-term stress = helpful (exercise, exams, presentations).

• Chronic stress = harmful → multi-system damage.

2. Nervous System

• Chronic cortisol → shrinks hippocampus (memory, learning).

• Overactive amygdala → heightened fear/emotional responses.

• Effects: forgetfulness, depression, anxiety disorders, fatigue.

• Brain burns ↑ ATP during stress → mental exhaustion.

3. Endocrine System

• Prolonged cortisol elevation →

  • Insulin resistance → risk of Type 2 diabetes.

  • ↓ Thyroid function → fatigue, slow metabolism.

  • Women: disrupted menstrual cycles.

  • Men: ↓ testosterone.

• Anxiety worsens feedback loop: worry → ↑ cortisol → more anxiety.

4. Cardiovascular System

• Adrenaline: ↑ HR, vasoconstriction, ↑ BP.

• Chronic → hypertension, heart disease, stroke.

• Cortisol + adrenaline → arterial wall damage, plaque buildup, clot risk → heart attack.

• Anxiety: palpitations, chest pain (often benign but alarming).

5. Digestive System

• Stress diverts blood away from gut → slowed digestion.

• Problems: acid reflux, IBS, constipation.

• Cortisol → inflamed gut lining (tunica mucosa) → ulcers, poor nutrient absorption.

• Cortisol → ↑ cravings for sugary foods → weight gain, ↑ blood glucose.

• Anxiety worsens GI symptoms (nausea, appetite loss).

6. Musculoskeletal System

• Stress = chronic muscle tension (neck, shoulders, back).

• Outcomes: tension headaches, migraines, jaw clenching, poor posture.

• Constant contraction burns energy → fatigue.

• Anxiety intensifies sympathetic tone → exhaustion.

7. Immune System

• Cortisol suppresses WBCs → infections, slow wound healing.

• Chronic anxiety → inflammation, ↑ autoimmune risk.8l8l

8. Sleep

• High cortisol at night → insomnia, restless sleep.

• Poor sleep worsens anxiety, fatigue, obesity, diabetes, mental health decline.

9. Practical Stress Management Strategies

• Perception matters:

  • Much stress is about “what ifs” that never happen.

  • Same event = different stress levels depending on perception.

  • Practice reframing threats as challenges.

• Exercise:

  • Burns cortisol, releases endorphins, strengthens heart/muscles.

  • Ideal = mix of resistance + cardio (Zone 2 steady + HIIT).

• Unplugging:

  • Daily media-free time → mental reset.

  • Helps reconnect with body, nature, and thoughts.

• Mindfulness & breathing:

  • Activates parasympathetic (rest & digest).

  • Effects: ↓ HR, ↓ BP, ↓ RR, ↑ mood & emotional regulation.

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

• Professional help:

  • Counseling, therapy, or medications when stress/anxiety overwhelming.

  • Medications can help stabilize → some taper off later, others continue long-term.

Key Takeaways

• Chronic stress + anxiety = multi-system damage.

• Nervous, endocrine, cardiovascular, digestive, musculoskeletal, immune, and sleep systems all affected.

• Lungs & heart may suffer first → hypertension, plaque, arrhythmias.

• Brain shrinks under cortisol; anxiety worsens via amygdala hyperactivation.

• Lifestyle tools (perception reframing, exercise, unplugging, mindfulness) + professional help are essential for resilience.