Why am i getting stress fractures in ankle after sprain?

See a podiatrist: Your ankle may be unstable do to the sprain and the extra force may cause a fracture.

Cause/effect: It's certainly possible the same injury that caused the sprain is also responsible for an ankle fracture. A stress fracture, by definition, does not happen from one event, but rather from prolonged stress to the part. An examination and gait evaluation by a podiatrist may shed some light on the cause of your injuries.

Trauma: An injury to the ankle can result in a stress fracture. When an ankle is injured it is at risk for further injuries.