Shin splints: why they happen and how to come back
Shin splints are almost always a load problem wearing a shoe problem costume. What causes them, what actually helps, and how to come back without going straight round the loop again.
Table of contents
Shin splints — properly, medial tibial stress syndrome — is diffuse pain along the inner edge of the shin bone, usually in the lower third. It is one of the most common running injuries and one of the most commonly mismanaged.
Important distinction first. Diffuse, spread-out ache along several centimetres of bone is the usual picture. Sharp pain at one specific point you can cover with a fingertip, especially if it hurts at night or when hopping, needs medical assessment — that pattern can indicate a stress fracture, and continuing to run on one is how a manageable problem becomes a long one.
What causes it
Almost always too much load, applied too quickly, for what your bones have adapted to.
Bone remodels in response to load, but slowly — the adaptation lags weeks behind cardiovascular fitness. Common triggers:
- Increasing mileage sharply, especially after a break
- Adding hills or speed work on top of existing volume
- A sudden switch of surface, particularly to concrete
- Returning to running at the volume you stopped at rather than below it
Weak calves and hips contribute, and so does very low cadence with a heavy overstride, but the load error is nearly always the headline.
Shoes matter less than the internet suggests, with one exception: if you changed shoes and the pain started, change back and see.
What actually helps
Reduce load, do not stop entirely unless it hurts to walk. Complete rest lets the pain settle and does nothing for capacity, so it comes straight back on return.
- Cut volume to whatever is pain-free, even if that is very little.
- Cross-train to keep fitness — cycling, swimming, elliptical are all fine and none load the tibia the same way.
- Load the calves properly. Heel raises, straight-leg and bent-knee, progressing to single-leg and then added weight. This is the part most people skip, and it is the part with the best evidence.
- Ice for symptom relief if you like, understanding it manages pain rather than fixing anything.
The return-to-running ladder
Only start when you can walk briskly for 30 minutes with no pain, and there is no tenderness when you press along the bone.
| Stage | Session | Rule to progress |
|---|---|---|
| 1 | 1 min run / 2 min walk × 8, every other day | Two sessions pain-free |
| 2 | 2 min run / 1 min walk × 8 | Two sessions pain-free |
| 3 | 4 min run / 1 min walk × 5 | Two sessions pain-free |
| 4 | 20 min continuous easy | Two sessions pain-free |
| 5 | 30 min continuous easy | Then rebuild volume 10% a week |
The rule that matters: pain during a run above about 3/10, or pain that is worse the next morning, means drop back a stage. Not push through.
Every run in this ladder is at easy effort. If you are not sure what that means, easy pace is the whole point.
Preventing the repeat
The cycle people get stuck in is: get shin splints, rest, feel fine, return at the old volume, get shin splints. Breaking it means returning below where you stopped and building from there — and keeping the calf work going once the pain is gone, not stopping the moment it stops hurting.
If your volume jumped because you were chasing a target date, that is the thing to fix. And if you are underfuelling, bone is one of the first things to suffer — that is covered here.
