Also, please try using a different charger first and observe if it still heats up. If it still heats up, go back to my earlier suggestion and have the phone checked.
Hi Cheryl. Do you have a lot of apps installed that is using the internet? They're probably syncing all at the same time making the phone hot. Force stop them and observe if the phone cools down. You might also want to try to uninstall some of apps. Otherwise, I highly suggest that you have the phone checked, maybe you need a battery replacement.