Hi, I Get A Stitch On My Right Side Only

Hi, I get a stitch on my right side only when ever I walk. I walked from my front door to my car which was only approx 10 meters away and I occurred a stitch. As soon as I stop it goes away. Also when I start a brisk walk. I get a stitch immediately and it doesn't go away until I have completely stopped. This has been going on for 2-3 weeks? HELP