Does Stress Increase Glucose Levels?
Yes, both physiological and emotional stress definitively raise blood glucose levels through counterregulatory hormone release (cortisol, epinephrine) that increases insulin resistance and gluconeogenesis. This is a well-established physiological response that occurs in both people with and without diabetes 1.
Mechanism of Stress-Induced Hyperglycemia
When you experience stress—whether physical (infection, surgery, trauma) or psychological (emotional distress, anxiety)—your body releases counterregulatory hormones including:
- Cortisol - increases gluconeogenesis and insulin resistance
- Epinephrine (adrenaline) - promotes glycogen breakdown and glucose release
- Glucagon - stimulates hepatic glucose production
These hormones work together to elevate blood glucose as part of the "fight or flight" response 1. In surgical settings, stress hormones and inflammatory mediators (interleukin 1 and 6) released during surgical stress lead to perioperative insulin resistance that can persist for several days 2.
Clinical Evidence
Recent real-world data confirms this relationship: A 2025 study using continuous glucose monitoring and ambulatory assessment found that daily life stress significantly increased glucose levels in insulin-resistant individuals (β = 6.24 × 10⁻³, p=0.005), though not in insulin-sensitive controls 3. This demonstrates that stress effects are amplified in those already at metabolic risk.
A 2024 longitudinal study of Chinese immigrants showed that increases in psychological stress and social isolation were independently associated with significant increases in fasting glucose over approximately 2 years, even after controlling for BMI and other factors 4. Notably, those with higher baseline stress experienced steeper glucose increases over time.
Experimental stress testing confirms acute effects: When patients with type 2 diabetes underwent the Trier Social Stress Test in the postprandial period, glucose concentrations were significantly higher compared to control days (mean difference 1.5 mmol/L, 95% CI 0.5-2.4, p=0.003) 5.
Clinical Implications by Population
In People With Diabetes
Physical stress (infection, illness, trauma, surgery) frequently aggravates glycemic control and may precipitate diabetic ketoacidosis or hyperglycemic hyperosmolar state—life-threatening conditions requiring immediate medical attention 6, 7, 8, 9.
Psychological stress is associated with:
- Significant increases in glycemic control difficulties 1
- Reduced awareness of hypoglycemia symptoms when distracted by stress 1
- Depression linked to worse glycemic outcomes 7
Management approach: Patients should increase blood glucose monitoring frequency during stressful periods and adjust insulin/food intake accordingly 1. The 2024 ADA Standards recommend screening for psychosocial concerns at least annually or when there is a change in disease, treatment, or life circumstances 6, 10.
In People Without Diabetes
Stress hyperglycemia occurs in individuals not previously known to have diabetes, particularly those at risk (obesity, family history, age >40, South Asian ancestry, previous gestational diabetes) 11. These individuals have worse peri-operative outcomes than those with known diabetes 11.
Critical pitfall: People developing stress hyperglycemia often don't have glucose tested as frequently as those with known diabetes, nor is intervention started despite poor glycemic control 11. This represents a dangerous gap in care.
In Insulin-Resistant Individuals
The 2025 real-world assessment demonstrates that insulin-resistant individuals are particularly vulnerable to stress-induced glucose elevations, even before developing overt diabetes 3. This highlights the need for stress management strategies in diabetes prevention for at-risk populations.
Practical Management Recommendations
During intercurrent illness or stress:
- Increase blood glucose monitoring frequency 1, 9
- Monitor for ketones in ketosis-prone patients 6, 9
- Patients on oral agents alone may temporarily require insulin 7, 8
- Ensure adequate fluid and caloric intake 7
- Watch for medication interactions—sulfonylureas interact with common antimicrobials (fluoroquinolones, clarithromycin, trimethoprim-sulfamethoxazole, metronidazole, fluconazole) causing severe hypoglycemia; consider temporarily stopping sulfonylureas when these are prescribed 6
For peri-operative stress: Peri-operative hyperglycemia is associated with increased length of hospital stay, surgical site infection, acute kidney injury, acute coronary syndrome, and critical care admission 11. Regular capillary glucose measurements with prompt intervention are essential, especially in people using GLP-1 receptor agonists for obesity who are at risk of stress hyperglycemia 11.
Psychosocial interventions: Given the bidirectional relationship between stress and glucose control, integrating stress management strategies into routine diabetes care is essential 3, 4. Screen for diabetes distress, depression, and anxiety at least annually using validated tools 6, 10. Refer to behavioral health professionals when indicated, ideally those with diabetes experience 10.
Key Takeaway
The stress-glucose relationship is not merely correlational—it represents a direct physiological mechanism that clinicians must actively address. The effect is particularly pronounced in insulin-resistant individuals and during the postprandial period. Both acute and chronic stress elevate glucose through well-defined hormonal pathways, necessitating proactive monitoring and intervention strategies tailored to individual risk profiles.