Besides a bad bearing, a brake problem could cause the noise. It is usually not difficult to move the caliper out of the way, remove the pads, and spin the hub to find a bearing problem yourself. Any hint of roughness, binding, or noise is bad. Tapered bearings should not be preloaded, and a small amount of play is normal. This means the hub should spin freely, with no vibration, grinding or roughness felt with your fingers touching the axle stub (any cap on hub removed).