I Keep Getting Side Stitches And Have Gained About 8

I keep getting side stitches and have gained about 8 lbs this month while continuing my healthy eating and working out 4-5 times a week. They are not abnormally painful, feels like I have been running or something, when I have just been sitting or doing normal activities throught out the day. I have been to my regular doctor already for a yearly check up this month.