the body will release inflammation while you workout to help rest and recover.. also to heal what it percieves to be trauma or injury
so what do you do in that situation? the answer is STOP.
it is especially important for some of you younger guys who get brainwashed watching these idiots on social media act like weight training is going to battle where you just push through injuries cause you are 'tough'.. no it isn't tough, it is stupid. you figure that out once you get older and those tiny issues become daily chronic injuries and you wish you would have listened to that dude (me) who is telling you to be smarter lol
some people will just go home and take a bunch of anti inflammatories and pain killers.. that is the dumbest thing you could do cause now you are stopping repair