Heating of phone during camera use, video calling and gaming results in eating up resources and heating the phone.
But if you're phone is heating up while it's in idle or standby state .
Then better visit samsung care.
And if heating is not that high in temperature then don't worry.
And if this helps please tap on 3 dots on my reply and accept as solution. Thanks
Dear Samsung Member,
Greetings from Samsung Customer Support!
Please visit this mentioned link to resolve your device heating issue: https://www.samsung.com/in/support/mobile-devices/why-the-device-heats-up-during-use/
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support