Should my IPAD get hot while using it.

I have had my IPAD 3rd Generation for several months now, and all of a sudden is started getting hot. I have look after it very well, and now I am concerned that it there maybe something wrong with. I am on a TABLET plan with Telstra. Can anyone assist me with this, will I need to get it serviced.

I turned it off, so it will cool down, recharged it, and it was cool, when I turned it on, after a couple of hours it was hot again.

Can anyone advise me on this please.