Stress fractures occur due to repetitive stress when the body is no longer able to absorb the shock and pressure of an action. Athletes are most susceptible to this injury and it typically occurs in the bones of the lower leg and foot. Stress fractures can be hard to detect because they are not caused by a major injury and the only symptom might be pain radiating from an area. These fractures can be small and hard to notice in x-rays but they are easily treatable and preventable with healthy diets, proper equipment, shoe inserts and rest.
For more information visit the American Academy of Orthopaedic Surgeons: https://orthoinfo.aaos.org/en/diseases–conditions/stress-fractures/