I had to actually stop walking at some point. There was just too much pain to take another step. I laid down with my legs uphill for a while. That seemed to help. That was the first trick I learned to reduce my knee pain. My particular problem is only when I am hiking downhill after putting in some miles. After some internet research, I have discovered that it may be due to "pronation" or flattening of the arch. The following are some pain-relief techniques that have worked for myself