Ask a PT Response: "Incorporation of a new variable usually can contribute to the onset of shin splints - your case of running more than you walk. Usually rest and avoiding activities which aggravate the condition are recommended. Hee is a genral article on this condition and the treatment options available to a PT: http://www.cyberpt.com/medialtibialstresssyndrome.asp . For my patient who have this condition, I would usually have them start off at a reduced distance and build their way back up for the distance/time of their walk/run once they are doing better. If you persist to experience symptoms, it may be a good idea to see a PT for an evaluation so the he/she could determine what could be contribuating factors. Best of luck to  you. "