1 . Delete Un wanted apps
first check ram size of your phone Go to settings- Application manager
If Your phone comes with 1gb ram immediatly delete big apps like facebook , Groups and another big sized application beacause this why your phone beacaomes heated
If you phone comes wityh 2gb/3gb its ok big apps not affected on your phone
2 . Check Your Wife is on/off
Wifi using battery draining faster
3. Check Your Phone Case Is Heavy
Use of heavy phone cover ( Back cover ) battery heating fast
4. Check Your bateery is old
Change battery after 6 months of using (Reccomended)