What a stress fracture is
Bone is living tissue that constantly rebuilds itself in response to load. A stress fracture happens when repeated loading outpaces that rebuilding, creating microscopic damage that accumulates. It sits at the far end of a spectrum that starts with bone stress and, caught early, never becomes a fracture at all.
Common sites in young athletes are the shin, the foot bones, the heel, the hip and the lower back, depending on the sport.
How it differs from the usual aches
Suggests bone stress
- You can cover the sore spot with one fingertip
- Pain increases as the session goes on
- Hurts to hop on that leg
- Sore at rest or at night
- Progressively worse week on week
More typical of load-related soft tissue
- Sore over a broad area
- Eases once warmed up
- Hopping is uncomfortable but possible
- Settles with rest within a day
- Fluctuates with training volume
Bone stress behaves differently to muscle or growth plate irritation.
Why they happen
This is why a stress fracture is rarely just a bone problem. It is usually a training and fuelling problem showing up in the bone first.
- A sudden jump in training: preseason, a tournament block, a new sport or a return after time off.
- Not eating enough for the training being done, which reduces the body's ability to build bone.
- Low calcium or vitamin D intake, common in UK winters.
- Disrupted or absent periods in teenage girls, a signal of low energy availability.
- Very high volumes of one repetitive activity, such as distance running, gymnastics or fast bowling.
What to do if you suspect one
Stop the aggravating activity and get an assessment. Diagnosis is clinical to begin with, and imaging may be arranged, standard X-rays often miss early stress fractures, so a normal X-ray does not rule one out.
Do not manage suspected bone stress with the modify-and-continue approach that works well for apophysitis. The tissue needs a genuine offload period before rebuilding.
Higher risk sites
Pain in the groin or front of the hip, the front of the shin, the top of the foot near the ankle, or the lower back needs prompt medical assessment. These sites heal less reliably and are managed more conservatively.
Recovery and rebuilding
Total time is commonly six to twelve weeks for straightforward sites, longer for higher risk ones. The rebuild is where impatience causes recurrences, and roughly a third to a half of stress fracture recurrences happen because the underlying cause was never addressed.
Phase 1
Offload, 2 to 6 weeks
Pain-free walking, cross training such as swimming or cycling if allowed, address fuelling.
Phase 2
Strength
Progressive resistance work for the whole limb and trunk, no impact yet.
Phase 3
Reintroduce impact
Walk-jog progressions, then continuous easy running, small weekly increments.
Phase 4
Speed and sport
Faster running, jumping and sport drills, then full training and matches.
A typical low-risk stress fracture pathway, guided by a clinician.
Reducing the risk
- Increase training volume gradually and avoid stacking a tournament week onto an already heavy month.
- Eat enough, and eat regularly across the day, especially around training.
- Include calcium-rich foods, and consider vitamin D over the UK winter, ask a GP or dietitian.
- Include resistance training, strong muscles and loaded bone both improve bone health.
- Treat missed periods, persistent fatigue or repeated bone injuries as a signal to seek proper assessment.