Tell more about your laptop please:
- what model?
- what CPU?
- what graphics?
- how old?
- did it always do it or only recently?
- when it is so loud, what is the CPU usage?
- when did you last do the yearly cleaning of the fans
The hotter the machine (i7 CPU, programs running, not cleaned) the louder the fan. That's OK. Otherwise the CPU would be damaged. Nothing in your current post tells it's TOO loud.
What could the problem be? Do I need to oil it or replace the fan?