Stress fractures are small cracks in a bone that occur due to repetitive force or overuse, often seen in athletes or individuals who increase their activity levels suddenly. They commonly affect weight-bearing bones, such as those in the foot, ankle, and shin. Symptoms of stress fractures include localized pain that worsens with activity and improves with rest. Diagnosis typically involves a physical examination and imaging tests like X-rays or MRI. Treatment usually consists of rest, ice, and sometimes a brace or crutches to allow the bone to heal properly.