Why do MacBook devices overheat?

Perhaps the MacBook (build model year version, undisclosed) has

background activity that keeps its processor &/or cpu 'running-on.'

You can use Activity Monitor to look into all applications; and can

close or quit some of those. ~ Or change other settings in Mac to

offset the symptoms of heat generation. There are articles online

and others in Apple Support, with ideas on how to manage Macs.

• Activity Monitor User Guide [ Table of Contents ] - Apple Support

https://support.apple.com/guide/activity-monitor/toc

Temperature can be monitored. For free tool that also sets fans, here:

• Mac Fans Control - crystalidea.com:

https://crystalidea.com/macs-fan-control

Better prevention means to let the Mac keep itself clean. Do not use mackeeper junkware

or other. When you may need to run something to see if your mac may need attending to

+ learn how to use it correctly; and when helpful to run, use Malwarebytes for Mac.

• Malwarebytes for Mac [download link + instructions]

https://www.malwarebytes.com/mac-download/

• How to remove the after-effects of adware ~ Mac Malware Removal Help/Support | MWB Forum

https://forums.malwarebytes.com/topic/236261-how-to-remove-the-after-effects-of-adware

Another useful tool to have (basic version runs free) to help keep Mac on his toes

is EtreCheck, this makes detailed report of what's running in Mac. To share or not.

• About EtreCheck

https://etrecheck.com/about

Both these ideas were originally by ASC members; part of Apple community.

Early 'pre-Malwarebytes for mac' was Adware Medic, and of The Safe Mac.