My knees have been burning so much today. I sit in a chair, with my legs bending naturally at the knee and hanging down. The muscles on the side of both knees burn like they are on FIRE within 30 seconds. I have to straighten them out to relieve the pain. Rinse. Repeat. Other times, I sit with my legs up in the recliner, keeping my legs straight in an effort to avoid the burning. When I let my feet down to stand, my knee joints are so stiff I can hardly walk. Boo. I hate you, Cushing's disease.