There is a vague pain just below the middle of the lower abdomen, and although there is a possibility of rectal cancer, it is not necessarily certain to be rectal cancer. There are many reasons for pain in this area; common causes to consider include intestinal infection or intestinal spasms and obstruction. Tumors can also cause pain in this area. In women, pain just below the middle of the lower abdomen also needs to exclude the possibility of pelvic inflammatory disease or gynecological inflammation, etc. It is necessary to complete examinations such as a color ultrasound and an upright abdominal plain film for confirmation. If the pain occurs repeatedly, further examinations including a complete blood count, inflammatory markers, and other relevant inflammation tests should also be completed for a clear diagnosis.