Hand pain

Hi everyone, I'm 18 and don't box, but plan to join a club sometime this upcommin year once I drop down to a better weight. Right now I'm 5'9" 182lbs and approx. 15% BF.
Anyways, I do a lot of weightlifting and a fair amount of work on a heavy bag. I've noticed I'm punching much, much harder now with my left jab and the last session I went as hard as I could go and my hand is really sore today. I wouldn't do punshups on open hands today from the pain in my left hand, but when I go on knuckles it feels alright. It the bones in the back of my hand/palm that hurt. It's not severe pain, but not comfotable. What could be causing this? I've heard of bones becomming compressed, could this be what it is? And what should I do? Just avoid the bag or go lighter with my jabs for the next few weeks until it heals up?
Thanks in advance!