In December 0f 2013, I fractured my collar bone. I did not seek medical treatment for it. the following may, I was diagnosed with pinched nerves, low hemoglobin and iron levels. With the help of vitamins and iron pills, my hemoglobin and iron levels have been brought back up. But I am experiencing a lot of fluid build up in my knees, and have to awaken about four times nightly to urinate. I have been for a cat scan and an MRI, xrays and blood test have all come back negative for any sign of disease. My doctor cannot explain the fluid retention on my knees, and I cannot get any form of relief as the fluid buildup is causing me discomfort at night. I am a 52 year old male, in good health, who went from a healthy and active 130 lb man, to a thin and frail man with a weight of 111 lbs, within six months. I cannot gain any weight. overall, I feel great, but have no muscle mass left which leaves me sore and stiff by the end of the day. I have been to numerous specialists who cant find a cause. The pinched nerve was in my neck and does not bother me anymore. what I would like to know is what is causing the fluid retention in my knees, and how can I alleviate the discomfort?