Medical peeps - stabbing pain? 
  Bit of an odd one this, for the last few days, and I guess it happened a few months ago also, I keep getting a sharp, stabbing pain in my left thumb (of all places) between the knuckle and the end of my thumbnail, where the nail grows from I guess.
 
 It's not bruised and I haven't injured it in any way, but I just receive some really sharp pains throughout the course of the day, and night - it woke me up the other night.
 
 It's more annoying, and painful than worrying, but I just haven't got any idea what it could be, and what could be causing this.
 
 Anyone got any ideas?