My male 13 year old cat has had limb and head jerking for about 4 years and it seem to be getting worse. It happens mostly when he is relaxed. Some times his whole body will jerk. The other day he almost lost his balance when his legs jerked while he was sitting at the top of the stairs. I can find no information on this problem - 2 vets have told me they have no idea what this might be. Another vet told me that the myeline sheaths on the nerves might be thinning or he might be having referred pain from when he was declawed (maybe 13 years ago by another owner?) or that he has a metabolic problem.