Overview
A stress fracture is a small crack in a bone caused by repetitive load rather than a single major injury. In the foot and ankle, it most often affects weight-bearing bones such as the metatarsals, heel, or lower shin. Pain usually builds gradually as the bone becomes overloaded, and it can limit walking because the area is tender with impact. If the overload continues, the fracture may worsen and take longer to heal.
Symptoms
You typically notice a sore or aching pain that starts gradually and becomes sharper with walking, running, jumping, or pushing off the foot. The pain is often localized to one spot and feels worse with weight-bearing, but may ease with rest. Swelling and mild bruising can occur, especially as it progresses. Some people also develop stiffness and reduced activity because they try to avoid the painful step.
Causes
Stress fractures develop when repetitive stress exceeds what the bone and surrounding tissues can tolerate. This can happen during sudden increases in training, changes in footwear, long periods on hard surfaces, or increased workload at work or in sports. Over time, microdamage accumulates in the bone until a visible or symptomatic fracture occurs.
Risk Factors
Risk is higher with rapid changes in activity level, high-impact exercise, and poor recovery between training sessions. Biomechanics that increase stress to the foot-such as excessive pronation, limited ankle mobility, or poor running form-can contribute. Lower bone density, vitamin D deficiency, inadequate calorie or calcium intake, and certain medical conditions or medications that affect bone health can also increase risk.
Prevention
You can reduce risk by increasing running or activity volume gradually and avoiding sudden jumps in mileage or intensity. Choosing supportive, well-fitted shoes and replacing worn footwear can help reduce repetitive stress. Strengthening the foot and lower leg, improving ankle mobility, and using rest or cross-training during flare-ups can support safer loading. If you have risk factors for low bone density, addressing nutrition, vitamin D, and medical causes with your clinician can reduce recurrence.
How the Diagnosis Is Evaluated
Clinicians start with a detailed history about where the pain is, how it started, and what activities or training changes preceded it. A physical exam focuses on pinpoint tenderness over the bone, pain with hopping or impact, and assessment of alignment and gait. X-rays may be normal early, so MRI or sometimes bone scan is often used when symptoms strongly suggest a stress fracture or when X-rays do not explain the pain. Not every patient needs advanced imaging immediately, depending on severity, duration, and exam findings.
Nonsurgical Treatment Options
Treatment is mainly aimed at protecting the bone while it heals and reducing pain. Most people need activity modification and often temporary immobilization or a walking boot, sometimes with crutches, to limit weight-bearing on the painful area. Anti-inflammatory or pain medicines may be used short-term for comfort, but the key healing step is reducing repetitive load. Physical therapy can help restore flexibility, strengthen supporting muscles, and correct gait or training mechanics to prevent recurrence. In selected cases, clinicians may address underlying contributors such as vitamin D deficiency or low energy intake, and a gradual return-to-activity plan is used once pain and function improve. Platelet-rich plasma (PRP) or other biologic injections are not standard first-line care for stress fractures, and corticosteroid injections are generally avoided because they may impair normal healing; decisions are individualized if considered at all.
When to Seek Medical Attention
Seek prompt medical evaluation if you have focal foot or ankle pain that worsens with weight-bearing and does not improve with rest. Get urgent care if you cannot bear weight, the pain becomes rapidly severe, or you develop significant swelling, redness, or fever. Contact a clinician quickly for worsening symptoms despite reduced activity, because delayed diagnosis can prolong healing.
Frequently Asked Questions
It may be possible to walk short distances, but pain with weight-bearing is a sign that you should limit activity and get evaluated.
Not always; X-rays can be normal early, and MRI is often used when symptoms are strong or X-rays are inconclusive.
They are generally avoided because they can interfere with bone healing, and the main treatment is load reduction and protection.
Next Steps
If your pain is pinpoint and worse with weight-bearing, reduce impact activity now and arrange an in-person evaluation to confirm the diagnosis and protect healing. Ask about imaging needs and a safe, stepwise return-to-activity plan based on your symptoms and exam findings.