The left lower abdomen is a bit bloated consider ulcerative colitis, improper diet, constipation and adnexitis and other causes. 1. Ulcerative colitis: Ulcerative colitis can be triggered after overeating or consuming irritating foods. Patients experience symptoms such as a little bloating and vague pain in the left lower abdomen. 2. Improper diet: If the patient has recently eaten stimulating food, such as drinking a lot of alcohol, eating cold food, etc., it will stimulate the mucosa of the gastrointestinal tract, appearing in the lower left abdominal bloating feeling, some patients will be accompanied by abdominal pain, nausea and other symptoms. 3. Constipation: Constipation is a common symptom rather than a disease, and the main symptoms of patients include decreased stool frequency, decreased stool volume, dry stool, left lower abdominal distension and other symptoms. 4. Adnexitis: The main reason for left adnexitis is that endometritis is not treated in time, and the inflammation spreads upward and spreads to the adnexa, causing a little bit of distension in the left lower abdomen. Patients with symptoms of left lower abdominal distension should go to the hospital in time for relevant examinations, and ask the doctor to make a clear diagnosis and correct treatment.