Pain and discomfort on the lower left side of abdomen can be due to several causes such as Crohn’s
disease, diverticulitis, infection in
kidney,
kidney stones, adhesions, polycystic ovary in females, IBS, and constipation. Hence IBS, Crohn’s disease and chronic constipation should be ruled out first.
Hope this helps. It is difficult to comment beyond this at this stage. Do consult your doctor for a referral to a gastroenterologist.