Galaxy S6 getting hot near power button and sim tray

[classna]

My galaxy S6 (duos) sometimes gets extremely hot near power button and sim tray. Is this normal and what could possibly cause this?

 

[B. Diddy]

Welcome to Android Central! How is the cell signal when this happens? If the cell signal is weak, it might be heating up because it's working harder to latch onto the signal.

 

[classna]

Makes sense. I will keep an eye on cell signal next time it happens.