If the left side of the small abdomen is sore, the following diseases should be considered: 1. urinary stones, manifested as soreness or colic in the left side of the small abdomen, the pain may spread to the perineum, and some patients may feel soreness in the left lower back. It is recommended that the patient improve urinary routine examination, urological ultrasound or CT examination. 2. Female patients with left-sided small abdominal pain should consider adnexal diseases, such as adnexal inflammation, adnexal tumor, etc. It is recommended that the patient go to the gynecologist and improve gynecological ultrasound examination. 3. Enteritis, often manifested as left-sided small abdominal pain, diarrhea, and in severe cases, blood in the stool, it is recommended that the patient improve colonoscopy. 4, If the patient has a large intestinal tumor, it will also cause small abdominal pain, accompanied by diarrhea, blood in the stool, and a feeling of urgency, so it is recommended that the patient improve colonoscopy. There are many diseases that cause left-sided small abdominal pain, so it is recommended that patients go to the hospital for a systematic examination to clarify the causes and carry out the corresponding treatment.