Left lower abdomen belly button left side of the Department of pain may have colon lesions, urologic lesions, intestinal dysfunction, women’s left-sided adnexitis and so on. 1. Colon lesions: the left lower abdomen for the left half of the colon, descending colon, sigmoid colon and other colon distribution location. If the patient suffers from colitis, colon cancer or colonic diverticulum and other diseases. Pain can also occur in the left lower abdomen. Patients can go to gastroenterology, general surgery or anorectal department for diagnosis and treatment. 2. Urological lesions: because the left lower abdomen has the ureteral route area, so the urinary stones can also cause pain in the left lower abdomen. The diagnosis can be made by combining the urine condition and specialized examination. 3. Intestinal dysfunction: this is the most common cause of left lower abdominal pain. Intestinal dysfunction, causing intestinal contraction, peristalsis and absorption changes, can cause left lower abdominal pain, often accompanied by changes in the shape of the stool. You can go to the gastroenterology department for diagnosis and treatment. 4. Women’s left-sided adnexitis: the left side of the lower abdomen is also the location of women’s adnexa, adnexal inflammation will also appear in the left lower abdominal pain, it is recommended that the combination of adnexal ultrasound and specialist examination to diagnose. Precautions: symptoms of left lower abdominal pain should be promptly to the medical institutions for diagnosis and treatment, in order to prevent delays in the condition.