The left side of the abdomen and waist pain with the feeling of wanting to poop, can be seen in the irritable bowel syndrome, ulcerative colitis, intestinal tumors, etc., need to be targeted to take the general treatment, drug therapy, surgical treatment. 1. Irritable bowel syndrome: often cause discomfort in the lower back and abdomen, and accompanied by changes in bowel habits, we should pay attention to adjusting dietary habits, avoid eating spicy and stimulating food, if the abdominal pain is obvious, you need to take antispasmodic and analgesic drugs, such as belladonna tablets, scopolamine. If there are mental problems, such as depression, need to take antidepressant drugs, such as amitriptyline. 2. Ulcerative colitis: it is a chronic non-specific inflammation that occurs in the colon area, which may lead to tummy ache, back pain and accompanied by diarrhea, generally need to take aminosalicylic acid preparations, such as mesalazine, salazosulfapyridine and so on. 3. Intestinal tumor: due to the tumor compression is also likely to cause these symptoms, usually need to take laparoscopic surgery or open surgical resection. The left side of the abdomen and lower back pain with the feeling of wanting to poop may also be caused by other reasons, it is recommended to go to the hospital in time to find out the cause and cooperate with the doctor’s treatment, do not take medication on your own, so as not to delay the condition.