My iPhone 5S has recently started heating up very fast?

For example, I would use it for a few minutes and the back (where my hands hold the phone) would be VERY hot. I also put it to charge last night and when I woke up, the back was, again, extremely hot. I was afraid it would catch on fire or something. This has been happening for about a week now, and this has never happened before! Also I'm very good at preserving battery (I close running apps, turn of location services, etc.) so I'm not sure why it's happening. Advice?

Have you left your iPhone charging on a bed or any soft surface? If so, do not do it. But if this isn't the case, there could be a problem with the battery or any other component within the iPhone. The back on the iPhone 5S is made of aluminium and is likely to get more hotter than the previous generation models (I assume). It's better you get it checked or serviced at an Apple Store
Cheers.

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