Vitamin D Deficiency and Foot Problems: What Every Patient Should Know

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Vitamin D: The Overlooked Factor in Foot Health

Vitamin D is essential for calcium absorption, bone mineralization, muscle function, and immune health. In Michigan — one of the least sun-exposed states in the country due to its northern latitude, cloud cover, and cold winters that keep residents indoors — vitamin D deficiency is remarkably prevalent. Studies estimate that over 40% of Americans are vitamin D deficient, with rates likely higher in Michigan populations.

What many patients don’t realize is that vitamin D deficiency has direct, measurable effects on foot health. At Balance Foot & Ankle in Howell and Bloomfield Township, Michigan, we routinely consider vitamin D status as a contributing factor in specific foot problems.

Vitamin D and Stress Fractures

Vitamin D deficiency impairs calcium absorption and bone mineralization, reducing bone density. In the foot, this translates to higher risk of metatarsal stress fractures — among the most common overuse injuries in runners, military recruits, and active individuals. Multiple studies show that athletes with stress fractures have significantly lower serum vitamin D levels than those without fractures. Supplementing vitamin D in deficient individuals reduces stress fracture risk and supports healing in established fractures.

In our practice, we recommend vitamin D testing (25-hydroxyvitamin D serum level) for any patient presenting with metatarsal or calcaneal stress fractures, as deficiency contributes to both fracture occurrence and impaired healing.

Vitamin D and Musculoskeletal Pain

Vitamin D receptors are present throughout the musculoskeletal system including muscle, bone, and connective tissue. Severe vitamin D deficiency causes osteomalacia — softening of bone — which presents as diffuse deep, aching bone pain, including in the feet. This is often misdiagnosed as plantar fasciitis or other musculoskeletal conditions until laboratory testing reveals severe deficiency. Muscle weakness associated with vitamin D deficiency affects the intrinsic foot muscles and reduces ankle stability.

Vitamin D and Diabetic Foot Health

For diabetic patients — already at elevated risk for foot complications — vitamin D deficiency compounds the problem. Vitamin D plays roles in glucose metabolism and insulin sensitivity, and deficiency worsens glycemic control. It also affects peripheral nerve function, potentially accelerating diabetic neuropathy. Optimizing vitamin D status is an important adjunct to comprehensive diabetic foot care.

Testing and Supplementation

Vitamin D status is measured with a simple blood test for 25-hydroxyvitamin D (25(OH)D). Levels below 20 ng/mL are considered deficient; 20-30 ng/mL is insufficient; levels above 30 ng/mL are generally considered sufficient. For bone health optimization, many experts prefer levels above 40-50 ng/mL. Supplementation with vitamin D3 (cholecalciferol) is safe, inexpensive, and effective. Typical supplementation doses range from 1,000-5,000 IU daily, with higher doses for documented deficiency under medical supervision. Michigan residents should strongly consider routine vitamin D supplementation given limited sun exposure, particularly from October through April.

Practical Takeaways

If you are experiencing metatarsal pain, diffuse foot aching, stress fractures, or recurrent plantar fasciitis with poor response to treatment, ask your primary care physician to check your vitamin D level. Addressing a correctable nutritional deficiency may be a critical missing piece in your foot pain treatment. Our podiatrists can coordinate this testing request and incorporate findings into your comprehensive foot care plan.

Foot or Ankle Pain? We Can Help.

Balance Foot & Ankle — Howell & Bloomfield Township, MI

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Low Vitamin D? It May Be Affecting Your Feet

Vitamin D deficiency weakens bones and increases stress fracture risk, contributes to muscle weakness and cramping, and may worsen neuropathy. Dr. Tom Biernacki checks for vitamin D deficiency as part of comprehensive foot care evaluation.

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Clinical References

1. Holick MF. Vitamin D deficiency. New England Journal of Medicine. 2007;357(3):266-281.
2. Shipton EA, Shipton EE. Vitamin D and pain: vitamin D and its role in the aetiology and maintenance of chronic pain states. Pain Research and Treatment. 2015;2015:904967.
3. Allain TJ, Dhesi J. Hypovitaminosis D in older adults. Gerontology. 2003;49(5):273-278.

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Dr. Tom Biernacki, DPM

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Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.