My Laptop Fan Sounds Like a Jet Engine at 1% CPU Usage

I'm having an issue with my laptop fan, which sounds extremely loud, almost like a jet engine, even when the CPU usage is only around 1%. I have checked the system performance and noticed that the processor is barely doing any work, so I’m confused about why the fan is running so aggressively. Could this be caused by dust buildup, a faulty temperature sensor, background processes, BIOS settings, or a cooling system problem, and how can I diagnose and fix it?