The most common locations for hairline fractures are the bones of the legs and feet -- areas under a lot of stress during activities involving running and jumping. In particular, the second and third metatarsal bones in the foot are most commonly affected because they are thin bones that push the body upwards during running and jumping. The heel and ankle bones are also likely locations for hairline fractures. It is unlikely a person will develop a hairline fracture in bones of the upper body due to repeated stress, but in the rare instance when a hairline fracture is the result of trauma, the upper body can be affected.

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