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

Yes, it is normal.
During heavy usage(cpu and internet) phones tend to get warm.
If your phone is too hot to touch, then there's definitely an issue.
Also, during heavy usage the battery will drain faster.

If constantly using it of course it will start getting hot, thats fine.

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