Why is my iPhone 5s getting really hot?

My phone has been getting really hot lately. I got my phone in December for Christmas and it's in perfect condition. Just concerned about it being really hot.
Any thing so I can fix this problem?

Heavy usage, e.g. Long talk time, gaming, etc. Can do that. Are you using it for long periods at a time?

  • Why is My iPhone is getting hot? When I charge my iPhone I normally am still on it or it's in my bed with me and it gets so hot. I've only had it for a month! What is going on It's a Verizon iPhone 5s
  • Why is my iphone getting hot? My iphone 3gs is getting hot when I use apps o fb is that normel it was running good and battery was doing good but the past few days it been running hot and today and today only it didn't get hot but my battery ran fast what's going on help please
  • Why is my iPhone 3GS getting hot? My IPhone is getting hot when I look in App Store and play apps why is it and sometimes it runs slow about 2 mounts ago it stayed cool and ran nice why is it messing up now anyone please help
  • My iphone 4s got really hot? Last night my actual phone and not just the charger got really hot to the touch. I've only had it for about a month and thats the first time its done it. I just turned it off and turned it back on in the morning and it was fine but it freaked me out. What's wrong with it?