Climate and Environmental Conditions as Modifiable Risk Factors for Diabetic Foot Ulcers

Foot ulcers are among the most serious complications of diabetes, often leading to infection, hospitalization, and amputation. While intrinsic factors such as neuropathy, peripheral arterial disease, and glycemic control are well-recognized contributors, extrinsic environmental variables—particularly climate and physical surroundings—exert a powerful and often underappreciated influence on ulcer development. Temperature extremes, humidity levels, terrain, and seasonal weather patterns can directly affect skin integrity, circulation, and wound healing. Understanding these relationships is essential for tailoring prevention strategies and improving outcomes in high-risk populations.

How Climate Modifies Skin Physiology and Wound Healing

The skin serves as the body’s first barrier against infection and injury. Climatic conditions alter its structure and function in ways that can either protect or predispose to ulceration. High ambient temperatures increase perspiration, which can soften the stratum corneum—a process called maceration—making the skin more fragile and prone to tearing. Conversely, low temperatures trigger vasoconstriction in peripheral vessels, reducing blood flow to the feet and impairing the delivery of oxygen, immune cells, and growth factors needed for tissue repair. These vascular changes are particularly dangerous for individuals with existing peripheral artery disease (PAD) or autonomic neuropathy, because their compensatory mechanisms are already compromised.

Humidity levels also influence microbial colonization. Warm, moist environments encourage bacterial and fungal overgrowth, while arid conditions can cause excessive dryness and cracking of the skin. Both scenarios create portals of entry for pathogens and increase the risk of infection, which is a primary cause of nonhealing ulcers. The interplay between climate and foot health is not merely theoretical—epidemiological studies have identified geographic variation in diabetic foot ulcer prevalence. For example, research published in the Journal of Wound Care found higher rates of foot ulceration in tropical compared to temperate regions, even after adjusting for diabetes duration and control. Climate must therefore be considered a modifiable risk factor that can be managed through behavioral and environmental adjustments.

Regional Climate Patterns and Their Specific Risks

Tropical and Subtropical Climates

In tropical regions characterized by high temperature and humidity year-round, foot ulcer risk is elevated due to persistent moisture and heat. The constant sweat layer on the skin accelerates maceration, especially between the toes and on the plantar surfaces. Additionally, the warm environment promotes the growth of bacteria such as Staphylococcus aureus and Pseudomonas aeruginosa, as well as dermatophytes responsible for athlete’s foot. Fungal infections can cause fissures that progress to ulcers. People living in these climates should adopt rigorous foot hygiene protocols, including twice-daily washing with mild soap, thorough drying (particularly between the toes), and the use of moisture-wicking socks made from merino wool or synthetic blends. Antifungal powders may be beneficial for prophylaxis.

Heavy rainfall common in monsoon and rainy seasons introduces another environmental hazard: frequent wet feet. Prolonged exposure to water, whether from puddles or inadequate footwear, softens the skin further and reduces its mechanical strength. In a study from a Brazilian diabetes clinic, patients with higher monthly rainfall exposure were more likely to develop new ulcers during the wet season. Waterproof but breathable footwear is essential in such conditions. Sandals should be avoided because they offer no protection against ground moisture and do not shield the feet from sharp debris.

Cold and Temperate Climates

Cold weather imposes different challenges. Vasoconstriction reduces skin temperature and capillary perfusion, which can precipitate or worsen ulcers in neuropathic feet that already lack protective sensation. Patients with severe neuropathy may not feel the cold adequately, increasing the risk of frostbite. Even mild cold exposure can impair the inflammatory response needed for healing. A study in the Journal of the American Podiatric Medical Association reported a seasonal pattern, with more foot ulcer presentations in winter months in northern latitudes. This is compounded by the use of heating devices (space heaters, hot water bottles) that can cause burns without the patient’s awareness—classic examples of “neuropathic burns” that often present as first-time ulcers.

To stay safe in cold climates, patients should wear insulated, well-fitted boots and avoid tight socks that constrict circulation. Layering with a moisture-wicking base layer and a waterproof outer shell helps keep feet dry despite snow and slush. Indoor activities that encourage peripheral circulation, such as leg raises or ankle pumps, can offset the effects of vasoconstriction. Home heating should be maintained at a comfortable temperature, but direct heat sources should be placed out of reach of patients with sensation loss.

Arid and Desert Climates

Dry heat creates a separate set of problems. Low humidity causes rapid moisture loss from the skin, leading to xerosis (abnormally dry skin) and fissures, particularly on the heels. These cracks, if deep enough, can become infected and develop into full-thickness ulcers. Daily application of emollient creams containing urea or lanolin is critical in arid regions. Sand and dust can also accumulate inside shoes, causing friction blisters or punctures in the neuropathic foot that go unnoticed. Patients should inspect the inside of footwear before putting them on and use gaiters or shoe covers when walking on sandy terrain. Walking barefoot on hot sand is dangerous—surface temperatures can exceed 49 °C (120 °F) leading to thermal injury without pain perception.

Environmental Conditions Beyond Climate

Weather is only one component of the environmental picture. The physical environment—including indoor flooring, walking surfaces, and occupational exposures—also interacts with climate to influence ulcer risk.

Terrain and Surfaces

Walking on uneven, hard, or abrasive surfaces increases mechanical stress on the foot. For patients with loss of protective sensation, stepping on a pebble or a sharp object may not be felt until a wound appears. In rural or developing areas where paved roads are scarce, walking on dirt or gravel roads is common and raises the risk of puncture wounds. Even indoors, area rugs with curled edges or hardwood floors can cause trips or friction injuries. Recommending supportive footwear with thick, cushioned soles—both inside and outside—is a primary preventive measure. For patients who must walk on rough terrain, custom orthotic insoles can help redistribute pressure away from high-risk areas like the metatarsal heads.

Occupational and Recreational Hazards

Occupations that involve prolonged standing, exposure to water (e.g., fishing, farming, kitchen work), or the use of heavy machinery expose the feet to repetitive stress and potential injury. Similarly, recreational activities such as hiking, gardening, or playing sports on artificial turf can lead to abrasions or blisters. In all cases, the activity must be matched with appropriate protective gear, including padded socks, proper footwear, and regular foot checks during breaks. Employers should be educated to provide accommodations such as anti-fatigue mats and access to clean foot hygiene stations.

Seasonal Variability and Prevention Calendar

Foot care routines should be adjusted seasonally. The following table provides a summary of targeted strategies by season, though in HTML we present as a bullet list for simplicity.

  • Spring: Transition to breathable footwear as temperatures rise; check for any winter-induced dryness or fissures; begin daily use of antifungal powder.
  • Summer: Emphasize hydration and moisture-wicking socks; avoid walking barefoot on hot surfaces; inspect for blisters or maceration after exercise.
  • Autumn: Prepare for cooling temperatures; ensure winter shoes are roomy enough for thick socks; increase emollient use to prevent xerosis.
  • Winter: Insulate feet and maintain indoor humidity (use humidifier if necessary); avoid direct heat sources; perform daily vascular checks (color, temperature, capillary refill).

Regular podiatry visits at least quarterly are recommended for high-risk patients regardless of season. Clinicians should also counsel patients on recognizing early signs of environmental injury such as persistent redness, new blisters, or changes in skin texture.

Evidence-Based Prevention Strategies for All Climates

Foot Hygiene and Skin Care

Daily washing with lukewarm water and mild soap, followed by thorough drying (especially between toes), is foundational. The American Diabetes Association recommends applying a moisturizer to dry skin but not between the toes to avoid creating a moist environment for fungi. Over-the-counter urea-based creams are particularly effective for heel fissures in dry climates. Patients should never use sharp objects to remove callus; a pumice stone used gently is safer.

Footwear Selection and Socks

Proper footwear is the most critical external factor in ulcer prevention. Shoes should have a wide toe box, a firm heel counter, and a cushioned insole. Socks should be seamless, moisture-wicking, and changed daily. Custom-made diabetic shoes or therapeutic shoes are recommended for patients with foot deformities (e.g., Charcot foot) or a history of ulceration. Medicare and many insurers in the United States cover these under the Medicare Therapeutic Shoe Bill for qualifying patients. For those in low-resource settings, extra-depth shoes with padded insoles can be purchased online and modified by a pedorthist.

Temperature and Humidity Control in Living Environment

Indoor environmental optimization is often overlooked. Maintaining a relative humidity of 40–60% helps prevent both excessive dryness and dampness. A dehumidifier may be needed in tropical climates, while a humidifier may benefit those in arid regions. Flooring should be smooth without sharp transitions, and area rugs should have non-slip backing. For patients who must stand for long periods, anti-fatigue mats reduce localized plantar pressure. Additionally, the use of floor heating (radiant heating) can keep surfaces warm without blowing dry air, which is better for skin than forced air systems.

Diet and Hydration

Systemic factors also affect foot health in relation to climate. Adequate hydration (especially in hot weather) maintains skin elasticity and supports microcirculation. A diet rich in vitamin C, zinc, and protein is essential for collagen synthesis and wound healing. Glycemic control is paramount: sustained hyperglycemia impairs immune function and delays healing, exacerbating the impact of any climate-related insult. Patients who live in areas with extreme heat or cold should work with a dietitian to ensure optimal metabolic control during environmental stress.

Special Populations and Global Considerations

Climate-related ulcer risk is not uniform; it varies by geography, socioeconomic status, and access to care. Indigenous populations in remote tropical areas often lack access to clean water, proper footwear, and regular podiatry. These structural determinants must be addressed at a public health level through community-based foot screening programs and subsidized footwear distribution. Similarly, homeless individuals in cold climates face dramatically increased risks of frostbite and ulcers; outreach services should include shelter, warm socks, and foot clinics in winter months.

Healthcare providers should be aware of local epidemiological data. For example, a study from the International Working Group on the Diabetic Foot (IWGDF) noted that the highest amputation rates in the world occur in Pacific Island nations and parts of Central America, where tropical climate interacts with limited healthcare infrastructure. IWGDF publishes global guidelines that include environment-specific recommendations, such as the use of insect repellent to prevent bites that can become infected in at-risk feet. The CDC offers patient education materials on foot care adapted for seasonal changes. Additionally, a 2020 systematic review in Diabetes Research and Clinical Practice found that biomechanical interventions (insoles, offloading footwear) are more effective when prescribed with attention to the patient’s daily environment. Diabetes UK provides climate-specific tips, such as checking feet after walking on hot pavement. Finally, the World Health Organization emphasizes foot care in its diabetes management protocols, though climate is often missing from national guidelines—a gap that needs closure.

Patient Education and Self-Monitoring

Empowering patients to self-monitor is the cornerstone of prevention. Daily self-inspection of both feet using a mirror (or assistance from a caregiver) should be non-negotiable. Look for changes in skin color, temperature, swelling, or any break in the skin. The “feet on the floor” rule: before putting on shoes, inspect the inside. After outdoor activity, check for foreign objects or moisture. Patients should be taught to palpate for warmth differences between feet, as unilateral warmth can indicate inflammation or infection. In cold climates, using a handheld mirror to examine the soles avoids bending and risking falls.

Healthcare providers can reinforce education with written handouts and videos tailored to the patient’s climate zone. For instance, patients in arid regions should be reminded to moisturize twice daily, while those in humid areas should be reminded to use powders. Seasonal reminder phone apps can prompt foot checks and shoe changes. Family members should be trained to assist patients with visual or mobility impairments.

Conclusion

Climate and environmental conditions are not static background factors; they are active determinants of foot ulcer risk. By understanding how temperature, humidity, terrain, and seasonal patterns affect skin integrity and circulation, patients and clinicians can implement targeted prevention strategies. Adapting foot care routines to local environmental realities—whether by choosing climate-appropriate footwear, modifying indoor humidity, or adjusting activity levels—can substantially reduce ulcer incidence and the cascade of complications that follow. As global climate patterns shift, the intersection of diabetes and environment will grow in importance. Healthcare systems must integrate environmental risk assessment into routine diabetes care and allocate resources to mitigate these modifiable hazards. With vigilant self-care paired with professional support, the impact of climate on foot ulcer risk can be minimized, improving quality of life and reducing the burden of diabetes-related amputations worldwide.