[ ] Left sided abdominal pain can be due to gastritis, left sided colitis ( infection of colon) or may be a muscular pain. If it's in loin or slightly lower back then it may be due to left
kidney stone. You need to go for a ultrasound of abdomen to rule out above problems, if this was done and was inconclusive then a CT SCAN OF ABDOMEN WITH ORAL AND I.V CONTRAST would help more . feel free to ask any further quary.