I was awakened this morning by severe toothache-like throbbing in both knees and could barely walk. Later, the pain radiated in my ankles. This has happened a few years ago and they told me it was tendinitis. I went to urgent care for relief where they did xrays. They said the xrays looked fine with the exception of possibly a little arthritis in my right knee. Currently, there is a dull ache only in my right knee. I did nothing differently over the past few days. Puzzled as to where the pain came from all of a sudden.