The Samsung Galaxy A31 is a mid-range Android device released by Samsung in April 2020. Identifiable by model numbers SM-A315(F, F/DS, G/DS, and G/DSL).
@nicholasmwendwa, is this happening when the phone is plugged in and charging? Or is it happening while it's only using the battery?
Did you also check the back of the phone for possible warping due to a swollen battery?
Note: It's always helpful to add some details about what was going on before the overheating started. For example: Did you drop it? Was it in a hot environment for a long period of time? Did you get liquid inside?
Answering these questions can help the Community to better troubleshoot this issue.
1 
@nicholasmwendwa, is this happening when the phone is plugged in and charging? Or is it happening while it's only using the battery?
Did you also check the back of the phone for possible warping due to a swollen battery?
Note: It's always helpful to add some details about what was going on before the overheating started. For example: Did you drop it? Was it in a hot environment for a long period of time? Did you get liquid inside?
Answering these questions can help the Community to better troubleshoot this issue.
Kris Rodriguez さんによる