Pressure pain in the left lower 3 centimeters of the navel, consider constipation, colorectal diseases, urinary system diseases, gynecological diseases and other problems. 1. Constipation: patients with a history of constipation because of the usual poor laxity, leading to cause intestinal accumulation of gas, there will be pressure pain in the left lower abdomen. 2. Colorectal diseases: descending colon, sigmoid colon, etc. are located in the left lower abdomen, so it is necessary to consider whether there is any inflammation, ulcer, tumor in the above intestinal tract, and it is recommended that the patient do colonoscopy, which can make a clear diagnosis. 3. Urological diseases, the left ureter passes through the left lower abdomen, when there is urinary tract infection or urinary stones, there can be pain in the left lower abdomen, and can be accompanied by urinary frequency, urinary urgency, urinary pain and other symptoms. 4. Gynecological diseases: for example, adnexitis can be manifested as pain in the left lower abdomen, which may be accompanied by a feeling of swelling in the lower abdomen. If the patient has left lower abdominal pain, it is best to go to the hospital to find a doctor to do a formal examination. Some patients do a lot of tests without any performance, without any organic changes, may be functional abdominal pain, symptomatic treatment can be.