What causes foot stress fracture?

Trauma: Repetitive amounts of low intensity trauma over time can lead to stress fractures.

See below: Exactly that stress placed on an abnormal way on the bone.

I think if : You investigate closely you will find a high proportion of these patients to have vitamin d deficiency. I examined chart records of the last 50 patients diagnosed with stress fractures. 49 of 50 all had vit d deficiency or insufficiency ( less than 30 mg/dl).