Pain and change in middle finger

Question
QUESTION: Iam 65 years old, have bowled since I was 9, My ave was 202, and now is 174 two years later. The question is. What causes the middle finger to bend to the right,with the palm up, towards the thumb. The last four weeks I have noticed severe pain and the change of direction. I use a 16 lb. ball

ANSWER: Do you use a conventional or finger tip grip?

Chip

---------- FOLLOW-UP ----------

QUESTION: finger-tip

Answer
I would take a look at the pitch that you have on the middle finger.  If needed, adjust it towards the direction the finger points in.  I would imagine the finger has been like that awhile but now is getting irritated enough to cause pain.  Even trying a looser insert, if you use inserts, would help.
Changing the pitch should be fairly easy to do.

Good luck,
Chip