When the performance components are stressed by demanding computing tasks, the housing heats up. However, if this is excessive, the components are in danger in the long run. Common reasons for this are:
Clogged fans.
Unsuitable underlays.
Defective software.
The main reason for a notebook getting hot quickly is usually a clogged fan, whose cooling capacity decreases due to dust on top. As with the desktop PC, dirt accumulates over time inside your laptop. However, this is much more serious with laptops because the entire system is designed to be compact.
The base is also often a factor in improper heating. The cooling system needs sufficient airflow to provide proper cooling. Note that the notebook should not be placed on surfaces that retain heat and impede airflow.
Note that if your laptop gets too hot, it can cause heat damage over time. There are a number of free programs for monitoring heat, such as HWMonitor.