crwdns2893792:0crwdne2893792:0 Tom Chai ,
There are several cause of heat buildup: Clogged heat sink, blocking heat dissipation, or Stuck process, very high CPU usage, running the system hot, or Intense but normal use. For the first scenario, put your laptop in a well ventilated place, if it doesn't work, clean the heat sink. For the second scenario, try to locate and kill the stuck process, find the cause for the software issue, update the software or avoid triggering the bug again For the third scenario, some applications are known to be intense, flash player to be an example. Take a break, have a cup of tea.