There are many diseases that cause pain in the left lower abdomen of the navel, the most common ones are as follows: 1, colon tumors, including colon cancer and rectal cancer. It is often accompanied by diarrhea, blood in the stool and a feeling of urgency, and some patients may have thin stools. 2. urinary stones, which usually manifest as left lower abdominal cramps, and the pain often spreads to the perineum, and some patients may have left lumbar pain. It is recommended that the patient improve the routine urine examination, urological ultrasound or CT examination. 3. If a woman has pain in the left lower abdomen, she should be alert to inflammation of the adnexa and adnexal tumors, and young women should also be alert to ectopic pregnancy, and it is recommended that the patient go to the gynecology department for timely consultation.