Stress fractures are small breaks in a bone caused by overuse from exercise.

The American Academy of Orthopaedic Surgeons says risk factors include:

• Playing sports, including tennis and basketball.
• Participating in athletic events, such as gymnastics and track and field.
• Moving in a way that the foot repeatedly hits the ground.
• Resting insufficiently between workouts.
• Being female.

Source: HealthDay