Yes, Excessive Stress Can Raise Blood Sugars
Yes, excessive physical, emotional, and psychological stress definitively increases blood glucose levels through the release of counterregulatory hormones (cortisol, epinephrine, glucagon) that increase insulin resistance and stimulate glucose production. This is a well-established physiological response that occurs in both people with and without diabetes 1, 2.
Mechanism of Stress-Induced Hyperglycemia
When you experience stress, your body activates a survival response:
- Counterregulatory hormones (cortisol, epinephrine, glucagon) are released 1
- These hormones increase insulin resistance in peripheral tissues 2
- They stimulate gluconeogenesis (new glucose production) in the liver 1
- Inflammatory mediators (interleukin-1 and 6) further worsen insulin resistance 2
- The result is elevated blood glucose that can persist for days after the stressor 2
Clinical Impact by Diabetes Status
In People WITH Diabetes
The effect is particularly pronounced:
- Type 1 diabetes: Stress can cause significant hyperglycemia and may impair recognition of hypoglycemia symptoms if distracted 1
- Type 2 diabetes: Acute psychological stress significantly increases glucose concentrations, especially in the postprandial (after eating) period, with increases averaging 1.5 mmol/L (27 mg/dL) 3
- Postprandial stress causes a 45-minute delay in glucose decrease after meals in Type 1 diabetes 4
- Depression and chronic stress are associated with significant difficulties in glycemic control 1
In People WITHOUT Diabetes
Stress still causes measurable hyperglycemia:
- "Stress hyperglycemia" is defined as blood glucose >140 mg/dL (>7.8 mmol/L) in previously non-diabetic individuals during acute illness or procedures 5, 2
- 40-50% of people with stress-related hyperglycemia during hospitalization are later diagnosed with diabetes within one year 5
- Increases in psychological stress and social isolation are associated with significant increases in fasting glucose over time 6
Types of Stress That Raise Blood Sugar
Physical Stress
Psychological/Emotional Stress
- Perceived stress and acculturative stress 6
- Negative life events 6
- Acute psychological stressors (threat, social stress) 3, 10, 4
- Depression 1
Clinical Management Recommendations
For patients with diabetes experiencing stress:
- Increase blood glucose monitoring frequency during stressful periods 1
- Adjust insulin and food intake accordingly 1
- Screen for depression at least annually and when complications develop 11
- Address diabetes distress separately from clinical depression, as it affects 18-45% of people with diabetes 11
Critical pitfall to avoid: Patients may not recognize hypoglycemia symptoms when distracted by stress, creating a dangerous situation where they miss warning signs 1. This requires heightened vigilance during stressful periods.
For hospitalized patients with stress hyperglycemia:
- Check HbA1c during admission if glucose >140 mg/dL without prior diabetes diagnosis 5
- HbA1c >6.5% suggests undiagnosed diabetes rather than pure stress response 5
- Close monitoring after discharge is essential, as up to 50% develop confirmed diabetes within one year 5
Important Nuances
Timing matters: The hyperglycemic effect of psychological stress is most pronounced in the postprandial state (after eating). In the fasting state, acute stress may not significantly raise glucose in some individuals 3, 4. However, physical stress (illness, surgery) raises glucose regardless of fed/fasted state 2.
Chronic vs. acute stress: While acute stress causes immediate glucose elevation, chronic psychological stress is associated with progressive increases in fasting glucose over time and increased diabetes risk 6, 12.
The evidence is unequivocal across multiple high-quality guidelines 1, 5, 13, 2, 9 and research studies 14, 6, 3, 4: stress raises blood glucose through well-defined hormonal and metabolic pathways, with clinically significant implications for both diabetes management and diabetes risk.