To get this resolved, we recommend you to try this very simple thing which is to connect your charger. This way your laptop will get an adequate supply of power and reduce chances of overheating(if it's caused by lack of power). However, it will work for you for a limited time until you find a proper solution to it.

If power shortage is not the reason behind your laptop's increasing temperature, change your charger as some faulty chargers can also cause your laptop to overheat. Change the charger and check whether you're getting better results or not.

The cooling pad will also help solve your problem if the reason behind it is inefficient cooling of the laptop. One reason for this could be the dust that has been gathered onto the fan which reduces its speed thus lesser cooling. Cooling pad will bring a noticeable change in your laptop's temperature. 

If you've overclocked your graphics card for a better gaming performance, the laptop will certainly overheat. Overclocked graphics cards put a burden on the hardware causing it to overheat. Although underclocking the graphic card will resolve your laptop's overheating issue heat but the performance will be reduced as. 

Make sure that your laptop has a better airflow so the internal components are cooled as well. To do this, elevate your laptop 1 or more inches. Blocked airflow might be the reason behind your laptop's overheating. Proper ventilation is vital so make sure you don't block its air vents, for instance by placing it on your bed, it will worsen especially if your laptop is undertaking a heavy task.

Mostly, overheating issues occur due to the dust that accumulates on the fans, this will reduce their speed hence affect its cooling adversely. With time the dust gathers and it becomes very necessary to wipe it off. Open up your laptop and clean it well. You can even take it to the repairance shop to make it easy for you. The air moving into the laptop should be filtered too, this will limit the amount of dust that moves into your laptop.

Cheap thermal paste or the one that has been used for over a longer period of time can also cause the temperatures to increase. It's cooling efficiency fades away and becomes a valid reason for rising temperature. It's advised to apply a high quality thermal paste and remove the older one. If you've recently applied a thermal paste and still not getting the expected performance, you must have made a mistake in the application of thermal paste. Read our guide of how to replace GPU's thermal paste to help you out.

Examine the fans inside your computer case, maybe they are not working properly or got unplugged mistakenly. Improper functioning of the fans will lead to inefficient heat dissipation. Open up your case and check the functioning of the fans.