I've been playing guitar for almost 3 years now. I practice about 2-4 hours a day depending on my schedule. Yesterday while playing for not very long my left index finger started to hurt. It still hurts everytime I try playing, the pain seems to be somewhere around the top-most joint. Is there anything I can do to prevent this from happening any longer? Also what could be causing this pain?
Let me just add, it's not any kind of intense pain tht keeps me from playing, more like an annoying factor. If i overdo it, though, it might just kep me from playing.