En medicina, se conoce como fractura por fatiga a la fractura ósea que se produce en un hueso sano sin que exista un traumatismo previo que la provoque. Suelen ocurrir en atletas o personas que realizan grandes marchas de forma habitual como militares. Las localizaciones más frecuentes son en los huesos metatarsianos del pie y la tibia.

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Stress fracture, also known as a hairline fracture, is a fatigue-induced fracture of the bone caused by repeated stress over time. Instead of resulting from a single severe impact, stress fractures are the result of accumulated trauma from repeated submaximal loading, such as running or jumping. Because of this mechanism, stress fractures are common overuse injuries in athletes. Stress fractures can be described as a very small sliver or crack in the bone; and are sometimes referred to as "hairline fractures". Stress fractures most frequently occur in weight-bearing bones, such as the tibia (bone of the lower leg), metatarsals, and navicular bones (bones of the foot). Less common are fractures to the femur, pelvis, and sacrum.

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