I fell, full weight, on my left knee when I was 17, & it has kept me updated on weather conditions ever since...aspirin, tylenol, advil, stronger painkillers when I can get 'em (& don't have to operate heavy machinery anytime soon ), & also non-stinky alagesic ointments like Myoflex or Aspercreme generally make life bearable again...& not to poo-pooh Bibi's idea, but you might want to clear it with a dr. 1st before going the exercise route, if there's real degenerative joint condition, exercise can sometimes make things worse (of course, I'll take any excuse not to exercise anyway )...

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