Since how many days are you having these symptoms ?
Have you undergone any X- Ray examination of the knee joint ?
Any associated pain in other joints of the body ?
Are you over weight ?
Have you seen a doctor ? Treatment history if any ?
Any associated history of cold sensation generalised all over the body ?
As such possible causes of such symptoms include mostly the problems with the nerve like neuropathy ( alcohol related, diabetes related etc) , vascular causes may include vascular insufficiency etc .
But some times change in enviornment can also cause such symptoms .Also associated knee injury , degenerative changes(OA) can cause such knee pain .As such a clinical examination may be considered in such a case .
Hope this helps
Dr Amit Munjal