For a little over a year I've been getting sharp shooting pain in my index finger where right before the nail starts. It only hurts when I bump it and I only have to bump it slightly for it to hurt like nothing else, Feels like it was smashed by a hammer but the pain goes away after a few seconds and I'm fine. What could be causing this? i'm a 29 year old male in great health I take no medication I'm in very good shape I eat right and I don't remember injuring my finger.