Fan Running Incessantly

Hi - The fan on my laptop is running incessantly. Just started this afternoon, the fan will not stop running non-stop.

Very loud. Very concerning. Sounds like its running full-speed non-stop. Working in a cool dry place.

Never has happened before.

!!! ???

Hardware Model: MacBook Pro 11,3 (mid 2014) Retina display.

Any known issues with this hardware?

How to stop this?

I'm afraid its going to run itself to death.

Help, please.

MH