What to do when HTC Desire 820 heats up?

My mobile phone htc 820 is gating heated so plz tell me what can i do now....
I have purchased this htc 820 in dec.
I m gettng worried regardng dis mattr.
please suggest any one how to reslove this issue.

Minimize running apps. Force stop rarely used apps by going to Settings > Apps > choose an app > Force stop.

Also minimizing brightness, turning off auto rotate, disabling connections (Wi-Fi, data connection, GPS) avoids phone from heating up.

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