I am experiencing stiffness, swelling and pain in my knee bend areas on back side of legs. Problems first occurred on left side, along with left hip pain and left neck pain (much like a crick in my neck). Three weeks later there was similar pain in left knee bend area, but not in the right him and neck. I was examined by my PCP along with NP. They agreed there were cysts in both knee bend areas.My question is that with the symptoms, I am experiencing and and my doctor s finding of cysts in both knee bend areas, what could be the possible causes? Thank you for your time and assistance, Corinne Bell