If you start getting pain in the ball of the foot, especially in the area between the metatarsals, it might be caused by a little fluid-filled sack (called a bursa) that sits between the metatarsals. 

Sometimes you get swelling of that little bursa, and it causes pain in the forefoot. 

This problem could be misdiagnosed or thought to be caused by a neuroma, an inflamed nerve that runs in that same area.

What is intermetatarsal bursitis in the runner's foot? 

Well, that is a great question and that is what we're talking about today on the Doc On The Run Podcast.