Some causes of seizures in older cats are acute poisoning, head injuries, stroke, metabolic disorders and epilepsy, states WebMD. Kidney and liver failure can also cause seizures. Bee sting reactions and fainting related to heart and lung disease often resemble seizures in cats.
Most typical seizures in cats are caused by poisoning from strychnine, antifreeze, rat poison, insecticides or lead, according to WebMD. Typical seizures are sudden bursts of activity the cat is unable to control. The burst of activity is combined with an altered level of consciousness, which gradually returns to normal. Atypical seizures may cause unusual behavior, such as rage or hysteria accompanied by licking, chewing, biting or scratching.