Final answer:
A stress fracture is a break in a bone that occurs due to repeated stress over time, often caused by activities like running or by conditions like osteoporosis.
Step-by-step explanation:
A break in a bone that occurs from repeated stress to it over time is called a stress fracture. This type of fracture is different from other fractures that typically result from a single, severe impact. Instead, stress fractures develop as a result of accumulated strain on the bone, often occurring in athletes or individuals engaging in repetitive activities, such as running.
Fractures are serious conditions that can vary from minor cracks to complete breaks, and they demand proper medical treatment. Osteoporosis and high-impact activities without proper rest can increase the risk of these fractures. Furthermore, to maintain bone density and reduce the risk of stress fractures, adequate intake of calcium and vitamin D is essential, along with engaging in weight-bearing exercises.