Sounds like a tendon: The Peroneus Brevis and Longus insert into the base of the 5th metatarsal. If there is injury or tightness to these tendons, this can bring about pain and spasms. It could also be brought on by gait pattern. Custom orthotics can help give these tendons proper biomechanics balance. Other considerations are stretching these musles in the leg.
Answered 5/8/2015
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