Hidden pain in left lower abdomen and old fart, common causes are large intestine lesion, small intestine lesion and other reasons, should consult doctor in time, clarify the specific reasons and follow the doctor’s instruction. 1. Colorectal lesions: common in colon cancer and colon adenoma, such as descending colon cancer and sigmoid colon cancer, sigmoid colon adenoma and rectal cancer, etc., which can lead to vague pain in the left lower abdomen, farting, usually accompanied by blood in the stool or change of bowel habit, and need to carry out colonoscopy to exclude whether the disease. 2. Small bowel diseases: usually neoplastic diseases (mesenchymal tumors, lymphomas and adenocarcinomas), abdominal CT examination is needed. Inflammatory diseases of the small intestine such as Crohn’s disease and intestinal tuberculosis can also be associated with vague pain in the left lower abdomen and excessive flatulence, which require gastrointestinal imaging. However, intestinal dysfunction can not be excluded, but to exclude organic diseases as a prerequisite. 3. Other causes: In addition, pain in the left lower abdomen and excessive flatulence are also thought to be related to gynecological diseases such as tubal cysts and uterine fibroids. Diseases of the urinary system can also lead to vague pain in the left lower abdomen and excessive flatulence, the most common are bladder stones and left ureteral stones. If the left side of the lower abdomen pain in the old farting symptoms are not relieved, or accompanied by other symptoms, you should go to the hospital in time to see a doctor, clear reasons to give targeted treatment.