A tiny crack in a bone caused by repeated stress or force, often from overuse.

Stress fractures are most common in the bones of the lower leg and foot that bear weight. Anyone can get this injury. But the risk is higher for people who do certain activities, such as track and field, tennis, basketball, and dance. Military recruits who carry heavy packs over long distances also have a higher risk of stress fractures.

Pain from a stress fracture often becomes worse over time. A tender feeling usually starts in a certain spot and gets better with rest. The pain tends to flare up while doing activities that cause the injured bone to bear weight. The painful area also might be swollen.

With a stress fracture, it's important to rest the injured bone. It also can help to place an ice pack on the painful area for 15 minutes every three hours. Some people need to wear a walking boot or brace, or use crutches. Less often, surgery is needed to help a stress fracture heal completely.