What Causes Side Stitches When Running? Share February 10, 2023 Dm4r Technology A side stitch—also known as a side ache or a cramp—is an intense stabbing pain in your side that occurs during exercise. Sometimes the pain goes away during your workout, and sometimes it sticks around until you stop exercising altogether. Read This Article on LifeSavvy › Source : What Causes Side Stitches When Running?