I am basing this on feedback I got from my pt when I had pain in my left shoulder and couldn’t bench press or do dumbbell presses on the bench.
said, could be rotator cuff, or it could be a small tear in one of the larger muscles in your shoulder. Probably as a result of lifting too heavy or making a wrong movement.
Meet with someone (eg a physiotherapist or a (sports) doctor)
Let them do an evaluation
And rest. I feel way less pain and have more strength and ability to lift again now after purposefully avoiding exercises that avoided making the movement that caused pain.
*DO NOT TAKE ADVICE FROM US, WE ARE NOT LICENSED PHYSICIANS OR ANYTHING*