There are lots of reasons to have pain within the ball of the feet. A more uncommon cause is a disorder called Freiberg’s disease or infarction. This is a medical condition where the end of a metatarsal bone that is at the base of the toes at the front of the front foot becomes weaker and has small fractures. https://therunninginjury.com/my-advice-for-freibergs-disease/148/