Jack up the front part of the vehicle.Then rotate and shake up the rim to see whether a wheel bearing is misaligned .If any misalignment is foundbetter, consult a service station for better service.
To check this, Jack your car up and raise its front. Then shake the tire up, down, left, right. This might fix the problem, if it doesn't, then there might be something else.
If you are having humming noises coming out of the front end of your car then you will need to take off the front bumper and examine and see what the problem may be. You should be able to fix the problem within hours and be able to put the bumper back on.
If you hear it when the car is running only try and see if it changes with higher RPM's, if it does its in the engine some where, bearing, waterpump......
If you have a Humming noise under your hood. It could be a number of problems. It could be a belt driven core or a damage part inside you engine. Thus you must locate the problem by using a stethescope while the engine is running and listening for extact location.