Stress Fractures: Symptoms, Diagnosis and Recovery in Runners
What is a stress fracture and why does it happen? Symptoms in the foot and shin, why MRI helps, which sites are high risk, how treatment works and why some stress fractures are slow to heal.
A stress fracture is a fine crack that develops when bone becomes fatigued by repeated loading rather than by a single blow. The typical sign is pain that starts during running or walking, eases with rest but grows as you keep loading it, and is focused on a spot you can point to. The bones of the forefoot and the shin bone are affected most often. X-rays can look normal early on, MRI is often decisive, and the core of treatment is giving the bone time to heal.
This article explains why stress fractures happen, who is at risk, which symptoms suggest one, why some are considered "high risk", how they are treated, and what may be going on when a stress fracture will not settle.
What is a stress fracture?
Bone is living tissue. Every load causes microscopic damage that the body constantly repairs. When training load outpaces that repair, the damage accumulates: first bone swelling, known as a stress reaction, and then, if loading continues, a visible crack. This is why stress fractures usually creep up over weeks rather than appearing with one event. Runners, military recruits, dancers, basketball and volleyball players, and long-distance walkers are commonly affected.
Common sites
- Metatarsals: especially the second and third, causing pain and swelling on the top of the foot.
- Tibia (shin bone): common in runners, with tenderness at one spot on the bone.
- Heel and navicular bones: pain at the back or middle of the foot.
- Fibula: the thin bone on the outer side of the leg.
- Femoral neck (hip): less common but important not to miss; it causes groin or front-of-hip pain.
Who is at risk?
- Training errors: increasing distance, frequency or pace too quickly, or skipping rest days.
- Surface and footwear: long runs on hard ground, worn-out or unsuitable shoes.
- Low energy availability: eating too little for the energy you burn harms bone health; in female athletes, irregular periods can be an important warning sign.
- Bone health: low vitamin D, low calcium intake and low bone density.
- Biomechanics: very high or flat arches, leg-length difference, muscle weakness.
- A previous stress fracture.
Our article on balancing nutrition and exercise for athletes looks at this side of prevention.
What are the symptoms?
- Pain that begins at a certain point in a run or walk and fades after you stop
- Over weeks, pain that starts earlier and eventually appears during daily walking or even at rest
- Pinpoint tenderness over the bone that clearly worsens when pressed
- Mild swelling, often more visible on the top of the foot
- Pain or difficulty hopping on one leg
- With hip stress fractures, a deep ache in the groin or front of the thigh that worsens with walking
Muscle soreness is usually more diffuse and settles within days. Steadily increasing pain at one spot on a bone should not be dismissed as normal training pain. See our article on whether post-workout pain is normal for the difference.
How is a stress fracture diagnosed?
Diagnosis begins with your training history and an examination. The doctor asks how the pain started, about recent changes in training, eating habits and, for women, menstrual cycles, then checks for tenderness over the bone.
- X-ray: often normal in the first weeks; a crack or healing bone may become visible later.
- MRI: the most valuable test early on, showing bone swelling and the crack, and helping separate a stress reaction from a true fracture.
- CT: sometimes used to see the detail of a crack in certain bones.
- Blood tests: vitamin D and bone health markers may be checked with recurrent stress fractures.
Low-risk and high-risk stress fractures
Stress fractures behave differently depending on their location.
- Low-risk sites: the shafts of the metatarsals, the inner side of the tibia and the fibula usually heal once load is reduced.
- High-risk sites: the tension (outer) side of the femoral neck, the front of the tibia, the navicular, the base region of the fifth metatarsal and the small bones under the big toe. Blood supply and loading patterns mean healing may be slow, and the fracture can complete or shift.
High-risk fractures need stricter offloading, and some require surgical fixation. A suspected femoral neck stress fracture in particular should be assessed without delay.
How are stress fractures treated?
- Reduce the load: stop the activity that causes pain. Depending on symptoms, crutches, a walking boot or a stiff-soled shoe may be used.
- Pain-free cross-training: swimming, pool running or, if your doctor agrees, cycling can maintain fitness.
- Address risk factors: nutrition, vitamin D and calcium, footwear and training plans are reviewed.
- Gradual return: once daily walking and examination are pain-free, running is reintroduced with a walk-run programme.
Low-risk stress fractures generally heal within several weeks to a few months; high-risk sites may take longer. Healing varies with the bone involved, the stage of the injury and the individual. In Prof. Dr. Gökhan Polat's clinic, the plan takes into account the site and risk category, the athlete's goals and the underlying risk factors.
Why won't my stress fracture heal?
- Continuing to run or walk long distances despite pain
- A high-risk site with a poor blood supply
- Uncorrected risk factors such as low energy intake, low vitamin D or low bone density
- Returning to sport too quickly
- Pain coming from a different cause altogether
In these situations the plan should be reviewed with a repeat examination and, if needed, further imaging.
How can stress fractures be prevented?
- Increase weekly mileage and intensity gradually, and follow hard weeks with lighter ones.
- Keep at least one or two rest or low-impact days each week.
- Replace running shoes regularly and vary your running surfaces where possible.
- Eat enough to match your energy expenditure, with adequate protein, calcium and vitamin D.
- Add strength work for the hips, calves and feet to your programme.
- Stop and rest when pinpoint bone pain starts rather than running through it.
When should you see an orthopedic surgeon?
- Pain at one spot on a bone that keeps increasing and does not settle after a few days' rest
- Pain that continues during daily walking, at night or at rest
- Swelling on the top of the foot with pain on weight bearing
- In runners, deep groin or front-of-hip pain that worsens with walking, which should be checked promptly for a femoral neck stress fracture
- A history of stress fractures, or bone pain together with irregular periods in female athletes
To learn more about how overuse injuries are assessed and treated, visit our sports injuries page.
In summary
- A stress fracture is a fatigue crack caused by repeated loading, often linked to a rapid rise in training.
- Pinpoint bone pain that starts with exercise and steadily worsens is typical; early X-rays may be normal and MRI is valuable.
- Stress fractures at high-risk sites such as the hip, navicular and front of the tibia need closer management.
- Treatment rests on reducing load, correcting risk factors and returning gradually; healing time varies between individuals.
This article is for general information only; diagnosis and treatment decisions are made individually after examination and the necessary tests.
FAQ
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How do you know if you have a stress fracture?
Pain that starts with running or walking, eases with rest but grows over weeks, and is focused on one spot on a bone suggests a stress fracture. There may be mild swelling and clear tenderness when pressed. Because early X-rays can look normal, MRI is often needed to confirm it.
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Do stress fractures heal on their own?
Stress fractures at low-risk sites usually heal once the painful load is reduced, but continued loading can make the crack worse. High-risk sites such as the hip, navicular and front of the shin may need stricter treatment and sometimes surgery, so a proper diagnosis matters.
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How long does a stress fracture take to heal?
Low-risk stress fractures usually heal within several weeks to a few months. Timing depends on the bone involved, the stage of the injury, whether risk factors are corrected and the individual. High-risk sites may take longer, and return to sport is planned gradually.
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Is it harmful to walk on a stress fracture?
It depends on the site and how painful it is. With a low-risk stress fracture, pain-free daily walking may be allowed, while painful walking is offloaded with crutches, a boot or a stiff-soled shoe. If a hip stress fracture is suspected, weight-bearing advice from your doctor must be followed.
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What causes a stress fracture?
A stress fracture develops when training load exceeds the bone's ability to repair itself. Rapid increases in mileage, hard surfaces and unsuitable shoes, low energy intake, low vitamin D and bone density, and biomechanical factors such as foot shape all raise the risk, and several usually act together.