Climb the ladder, if necessary, and locate the oil reservoir for your ceiling fan.
Add oil to the reservoir. Test the operation of the fan to ensure the noise has stopped. If your fan does not have an oil reservoir, continue to the next step.
Rotate the blades slowly by hand. Locate the area where the rotating parts connect to the stationary parts. This place is the location of the bearings.
Add a small amount of oil to the seam where the bearings are located. Allow it time to soak into the seam. Repeat the process every few inches around the seam, allowing time for the oil to soak in. Start the fan to test whether the noise has been fixed.