There are several causes of pain below the rib cage on the left side of the waist: first, consider that it may be caused by a bad stomach, it is recommended that you can take omeprazole to relieve. In addition, we should pay attention to a light diet, avoid spicy and stimulating, cold and greasy food, three meals should be regular, avoid overeating, and pay attention to abdominal warmth, and usually take more rest, do not overwork. The second, consider that it may be caused by lumbar strain or kidney stones, you need to do the relevant examination to clarify the cause and then targeted treatment.