Why does my Lumia 535 become heated?

[Windows Central Question]

my lumia 535 becomes heat

A week before I have purchased the Nokia Lumia 535, which becomes heat while running. plz... solve my problem. Whether it is manufacturing / technical fault of Nokia / Microsoft company ?

 

[ven07]

Re: my lumia 535 becomes heat

How hot is the phone getting? after how long? and which apps have the most usage?