If the stool routine is normal but the lower left side of the abdomen is distended, it may be caused by a condition such as colitis, urinary stones, or a torsion of the ovarian cyst tip. It is usually treated with medication or surgery. 1. Colitis: the main symptoms of abdominal distension, abdominal pain, may be normal stool routine, this time need to regulate the diet, can use mesalazine and other drugs to treat. 2. Urinary stones: when the stone occurs in the left lower ureter, due to ureteral obstruction, resulting in urine in the bladder and ureteral stagnation, there may be left lower abdominal distension, through the medication of lithotripsy, or surgical removal of the stone method of treatment. 3. Ovarian cyst tip torsion: If a female patient has ovarian cyst tip torsion, she will have left lower abdominal distension, accompanied by abdominal pain, vomiting and other symptoms, it is recommended to consult a doctor in time, and if necessary, surgical treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.