Also, your note about first one foot then the other is right on too. It seems true for me at least in other body parts too ... I just tore my right rotator cuff in Nov. and it is finally healing with the help of a great chiroprator (I;m 51 and had never been to one in my life) so it was a Big step for me to go see him. He came highly recommended by friends and also by my massage therapist. He uses a special kind of massage technique on the shoulder area and right into the cuff.... guess I'm drifting -- my orginal point was that from not using my right arm/shoulder normally, my left shoulder has now started acting up too. Now have tenderness in both shoulders and asked him today to work on the left one too. May be a natural body reaction or unique to a certain few of us but it seems overuse of any joint/tendon/connective tissue area does not work well in my body at least.