I started learning guitar around a month and a half back. Since the past 15 days or so I have this constant pain in my left index finger joint. This started about the time when I started learning chords. These days the pain is so much that I cant even completely fold my index finger. Pain on the finger tips is understandable and I am already past that stage. But why this pain in the finger joint? Its getting me a little worried. Did anyone face similar problems? I would really appreciate any kind of help.