There are several reasons why a ceiling fan may suddenly start wobbling. One reason is if one of the blades becomes warped. Just one bent blade will throw the balance of the entire fan off. If you keep running the fan like this, without replacing the blade, it can cause further problems, and even damage the motor. Make this easy repair as soon as you notice a warped blade.
Instructions
1. Set the ladder up a to the side of the ceiling fan, not directly underneath. Make sure you can safely reach the blades without having to stretch or hang over one side of the ladder. Turn off the fan.