My thumb became a bit numb when I was training for table tennis this morning, and it is still there 6 hours later. When playing it was about a 7 numb, now its about a 4. Just the final cm or so of my thumb. Is this something common for table tennis players nerves in the elbow or shoulder that might make the thumb numb? I also have minor back issues, especially lately, but never any nerve symptoms like numbness. I m 33, male, 150lb 5 9 and quite fit. I also have been doing pull ups for the past week everyday, which is a new routine, however i didnt have numbness until training today. Not really sure what else might cause this. I m also curious if this is common and how long i can expect to see symptoms. I would ideally like to identify the problem and correct it without stopping my exercise. Thanks man