Is anyone else's iPhone 15 Pro Max getting really hot?

Start by restarting it and checking Settings for battery activity. Look for an app using a lot of power in the background, especially if the heat continues after you stop using it. Check whether an iOS update is available too.

If it gets very hot during light use, keeps happening after a restart, or shows a temperature warning, contact Apple Support rather than assuming the battery health number rules out a problem.

Try taking the case off for a while and see if that makes a noticeable difference. A warm room or direct sun can add heat too, though that wouldn't explain it happening just as much in a cool room.

Some people have noticed heat after an iOS update, even during fairly light use. That doesn't establish the update as the cause, but it's worth noting when the problem started and whether battery drain changed at the same time. Those details could help if you contact support.

Let it cool down if it gets uncomfortably hot, and pause charging while you check it. If it won't cool down or charging repeatedly stops because of temperature, get it checked instead of putting up with it.