i'm sorry to hear you're going through this. here you are exercising like doctors tell us to and then you have an uncomfortable problem occur. it seems a little unfair doesn't it? i'm going to recommend you see a doctor about this. while several things could cause the symptoms you describe -- and i'm not a medical doctor myself -- your situation sounds an awful lot like it could be a baker's cyst. a doctor could tell you for sure. baker's cysts are not cancerous or life-threatening in any way. but they sure can interfere with exercise -- and even with activities of daily living. your doctor can suggest ways to treat the cyst on your own and if those don't work he or she can perform a small procedure to drain the cyst. of course your knee problems could have many other causes such as tendinitis and arthritis. your doctor can diagnose the issue with a physical examination and possibly an x-ray. wishing you well!
i have pain in the back of my left knee. after walking for a while i get an excrutiating pain to where i have to limp. after walking for about 30 minutes or standing long periods or driving a long distance i get a pain in the back of my left knee crease that feels like i cant straighten my leg out so i have to limp this also includes a burning sensation above the pain in my thigh. eventually i can mange to walk on it but it doesn't go a way unless i sit for a while. i have taken motrin since i know it helps with inflamation. i also can't bend my leg all the way back because of the pain.