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I am sorry to hear you are worried about Vivianna. I am a veterinarian and will do my best to help.
How long has she been shaking her head? Is she healthy in other ways: eating and drinking; normally active?
Shaking the head can be caused by ear problems, like infections, mites, or something like plant material or a tick in the ear. It can also be a form of a mini or partial seizure. I have seen a bad or infected tooth cause a cat to shake her head.
Let me know what other questions you have.
Is it her leg, or her head she shakes, or both? If it is her leg, it could be a nerve twitch or muscle pain.
It can be hard to determine if these are seizures or not. I usually start by having the owner try to get a video of the head shaking for me to watch. Seizures can be caused by many things: low blood sugar, liver disease, or a brain disorder. Seizures are not painful; people who have seizures say they just black out. If she is shaking her head, I would have her ears examined to see if there is anything in there, and if the ear drum is intact. You cannot see the ear drum without an otoscope, so this needs to be done at a vet office.
How is your cat doing?