Hidden pain in the left lower abdomen, flatulence and farting, the lesion is mostly located in the descending colon or sigmoid colon, which may be caused by indigestion, colitis, colorectal cancer and other diseases. 1. Dyspepsia: If the gastrointestinal dysfunction and indigestion caused by improper diet, eating too much spicy and stimulating food, or the intestinal flora imbalance caused by long-term medication, the hidden pain in the left lower abdomen with bloating and farting may occur. 2. Colitis: descending colon and sigmoid colon are located in the left lower abdomen, when there is hidden pain in the left lower abdomen, need to consider the possibility of colitis. Patients often in the left lower abdomen pain, can be accompanied by abdominal distension, farting, left lower abdomen hidden pain, pus and blood stool and other symptoms. When the disease is serious, fever, shortness of breath, fecal incontinence, arrhythmia and other symptoms may appear. 3. Colorectal cancer: it is often caused by repeated attacks of colorectitis. It mainly manifests as chronic, persistent or paroxysmal vague pain in the left lower abdomen, which may be accompanied by abdominal distension, farting, weight loss and other symptoms. In addition to the manifestation of colitis, colorectal cancer is also prone to anemia, emaciation, lower limb edema and other symptoms, which usually need to be diagnosed through pathological biopsy. When the symptom of hidden pain in the left lower abdomen occurs, it is necessary to pay attention to it and should go to gastroenterology department in time for further clarification of related examination, so as to facilitate the doctor’s diagnosis and treatment.