If the fan is making a lot of noise but it only sounnds like it is working hard you can try three things.
Toshiba satellite laptop fan noise.
To make the fan quieter first try cleaning off any dust or grime to make sure that the fan can run easily.
If the fan is still too loud you can change the fan speed using the bios basic input output system menu.
First see if anything is using a lot of cpu via task manager.
In this video brandon show the viewers how to open up a laptop and clean a dusty not working fan.
It will help you to get to the fan.
Your toshiba laptop uses a cooling fan to prevent the laptop from overheating but the fan can be noisy.
I was having the same problem on my toshiba satellite laptop after the win 10 anniversary update.
Try one of these guides to see if one is similar to your toshiba.
After taking the back off there are screws hidden beneath the pads closest to the hinge i figured out that although the fan was clean it would sometimes hit against the fan housing when it spun at certain speeds.
This will over work your cpu and thus your fans.
I was having that problem also.
I have a toshiba satelite that s a few years old.
To make the fan quieter first try cleaning off any dust or grime to make sure that the fan can run easily.
Your toshiba laptop uses a cooling fan to prevent the laptop from overheating but the fan can be noisy.
Also checkout this forum on loud toshiba fans.
The cpu fan was constantly running and things were staying hot.
See if any processes can be.
This video was uploaded from an android phone.
Instead of a gentle whir it was really loud.