You cannot rely on the symptom of pain in the lower left abdomen alone to determine whether it is bowel cancer or not. Bowel cancer requires histopathological biopsy to make it clear; pain in the lower left abdomen may also be caused by other factors, so you should consult doctor in time to find out the cause of the disease. Simply having vague pain in the left lower abdomen cannot be diagnosed as bowel cancer. Bowel cancer patients may have no obvious symptoms in the early stage, but when the disease develops to a certain extent, there may be symptoms such as change of bowel habit, change of bowel movement, abdominal pain, abdominal discomfort, abdominal mass, anemia, emaciation, fatigue, and low-grade fever, etc. And only histopathological biopsy can determine whether bowel cancer is the cause. And only histopathological biopsy can clarify the nature of lesions and determine whether it is intestinal cancer. There are many organs in the left lower abdomen, such as the upper part of the sigmoid colon and rectum, the left ureter, bladder, etc.; women will also have ovaries and the left part of the fallopian tube. If any of these parts are abnormal, it will lead to hidden pain in the left lower abdomen. So when the left lower abdomen pain, it is best to go to the hospital for ultrasound, CT and other examination of the abdomen to clarify the cause of the disease, by the doctor to give targeted treatment.