Left abdominal distension feels like a vague pain like flatulence, which may be due to colorectal inflammation, colorectal cancer and other symptoms, and can be treated with medication such as levofloxacin and mesalazine or surgery. 1. Inflammation of colorectum: such people may have increased frequency of bowel movement, urgency and heaviness (discomfort in the lower abdomen, wanting to defecate very much, and feeling of incomplete defecation after defecation), mucus stools and other phenomena, which can be treated by applying medicines such as levofloxacin, mesalazine, and so on, and the medicines need to be applied under the advice of doctors. 2. Colorectal cancer: this kind of people can have the phenomena of anxiousness, increased frequency of defecation, change of defecation frequency, mucus, pus and blood stools, anxiousness and heaviness. Abdominal pain feels as vague as flatulence, need to go to the hospital for colonoscopy to further clarify the diagnosis, if there are tumor lesions in the population, also need to carry out pathological biopsy to further determine whether there are cancerous tissues, it is recommended to consult the doctor in time.