I have a constant dull back pain on the left side and also in my abdomen.only heat helps my stools are green?

Left sided: Left sided abdominal pain,especially if there is associated tenderness, is consistent with diagnosis of diverticulitis of the colon. Inflammatory bowel disease is another possibility. Simple irritable bowel syndrome usually causes less discomfort. In view of the severity of your symptoms you should be examined now in the hospital emergency room where prompt attention and testing can be carried out