If your vehicle has a power steering pump then it could be due to low fluid. When your fluid gets low the power steering pump will suck air and this will cause a noise. This will happen due to a leak in your steering system and that could be from a hose, the power steering pump or your rack in pinion or steering gear. In all of the cases your vehicle would need to be looked at and properly diagnosed.
Give us a call and let us take care of you.