Based on the history you provided, below are possible causes for your cat’s stiffness. Not listed but a necessary consideration for possible cause of general stiffness at this advanced age is systemic cancer. Cancer present virtually anywhere in the body can lead to neurological and muscular pain that can manifest as general stiffness, through a process known as paraneoplastic syndrome. If you still seek further information, please visit our
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Medially luxating patella
Intervertebral disc disease