Phone temporary heating issue

My iPhone suffered a pretty heavy phyisical impact when it was charging. I felt it was heating up more afterwards but did not take it seriously as it was charging anyway. The next day I realised that the phone had a tendency to get very hot when in use. I could feel it on the back, but maybe it was even more noticeable on the screen. I put it away for a few hours and after that the issue disappeared. (Although the heating persisted for some hours as well.) Although, I can not tell for sure, but maybe now it gets hotter than before during charging? I can not tell for sure really. I am just wondering if I should rather get the logic board inspected or have the battery replaced (which is at 79% capacity and it writes in settings that it is degraded). Or maybe I should ignore it until the heating returns?