It could be

- the nut
- the trem/bridge
- the truss rod
- the intonation
- the gauge of string in proportion to the nut/bridge
- a combination of these above.

If you're not sure and you don't have a buddy that can help, take it to a shop.
Do you feel warm within your cage?

And have you figured out yet -

Life goes by?
Quote by Hydra150
There's a dick on Earth, too
It's you