What are the causes of itching in diabetes and how should it be treated?

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Last updated: October 13, 2026 • View editorial policy

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Itching in Diabetes: Causes and Treatment

For diabetic patients with itching, prioritize treating skin xerosis (dryness) with daily emollients and optimize glycemic control, as these are the two primary modifiable causes of pruritus in diabetes.

Primary Causes of Itching in Diabetes

The pathogenesis of diabetic pruritus involves two main mechanisms 1:

1. Skin Xerosis (Dryness)

  • Most common cutaneous manifestation in diabetic patients
  • Results from chronic hyperglycemia affecting skin structure and function
  • Significantly more advanced in patients with itch compared to those without 2
  • Lower stratum corneum hydration (SCH) correlates with pruritus severity 3

2. Diabetic Peripheral Neuropathy (DPN)

  • Patients with itch have significantly higher likelihood of neuropathy 2
  • Neuropathic changes alter sensory nerve function, lowering the threshold for itch perception
  • Chronic pruritus severity correlates with increased DPN prevalence 3

3. Poor Glycemic Control

  • Elevated fasting plasma glucose (FPG) is a significant risk factor 4, 2, 3
  • Itchy patients have significantly higher FPG levels compared to non-itchy populations 2
  • Prolonged poor diabetes control causes both skin dryness and neuropathy in long-standing diabetes 2

4. Additional Risk Factors

  • Longer diabetes duration 4, 3
  • Diabetic kidney disease (DKD) 4
  • Diabetic retinopathy (DR) 4
  • Hyperuricemia 3
  • Immune dysregulation with Th1/Th2 imbalance and elevated IL-4 levels 3

Epidemiology: Pruritus affects 18.4-27.5% of diabetic patients 1, with approximately 30% experiencing cutaneous manifestations 5.

Treatment Algorithm

Step 1: Optimize Glycemic Control

  • Target improved FPG levels as this directly impacts both xerosis and neuropathy
  • Poor glycemic control is the primary driver of diabetic pruritus 2

Step 2: Aggressive Skin Hydration (First-Line)

Daily foot and skin care protocol 6:

  • Wash feet daily with careful drying, particularly between toes
  • Apply emollients immediately after washing to moisturize dry skin (Strong recommendation)
  • Use urea-based creams for foot care 7
  • This provides significant relief in varying percentages of patients 1

Step 3: Treat Specific Skin Complications

Provide appropriate treatment for 6:

  • Excess callus removal
  • Ingrown toenails
  • Fungal infections with antifungal therapy (Strong recommendation; Very low evidence)
  • Pre-ulcerative lesions

Step 4: Pharmacologic Management

For Localized Pruritus:

  • Topical capsaicin 0.025% cream applied four times daily 8
    • Depletes substance P in peripheral sensory neurons
    • In uremic pruritus (similar mechanism), 14/17 patients reported marked relief
    • Five patients achieved complete remission
    • Prolonged antipruritic effect up to 8 weeks after cessation

For Generalized Pruritus:

  • Oral antihistamines may be effective, though RCT evidence is limited 8
  • Consider doxepin 10 mg twice daily (58% complete resolution vs 8% placebo) 8
    • Warning: 50% experience drowsiness; one patient may withdraw
    • Avoid long-term sedating antihistamines due to dementia risk 8
  • Alternative: Cetirizine 10 mg daily (non-sedating option mentioned) 8

Step 5: Address Neuropathy

  • Screen for and manage diabetic peripheral neuropathy
  • Consider that neuropathy has a "permissive effect" by lowering the itch threshold 8

Step 6: Comprehensive Nursing Intervention

For patients with persistent pruritus, comprehensive care interventions are superior to conventional care alone 4:

  • Structured education about skin care
  • Regular monitoring of pruritus mediators (substance P, β-endorphin, INF-γ)
  • Psychological support (anxiety and depression scores are significantly higher in itchy patients) 2

Common Pitfalls to Avoid

  1. Don't ignore pruritus as a minor complaint: It significantly impairs quality of life (mean ItchyQol score 41.2 points) and correlates with anxiety and depression 2

  2. Don't assume all diabetic itch is from xerosis alone: Screen for neuropathy, nephropathy, and retinopathy as these significantly increase pruritus risk 4

  3. Don't overlook fungal infections: These require specific antifungal treatment to prevent foot ulcers 6

  4. Don't prescribe antibiotics for uninfected skin: Clinically uninfected foot ulcers should not receive systemic or local antibiotics 9

Screening Recommendation

Consider diabetes screening in individuals presenting with chronic itch without primary skin lesions 1, as cutaneous manifestations may be the first sign of metabolic derangement 5.

References

1
Research

Itch in diabetes: a common underestimated problem.

Postepy dermatologii i alergologii, 2021

5
Research

Skin manifestations in diabetes-what is new?

Frontiers in medicine, 2025

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.