Left lower abdomen than the right lower abdomen bulging a little bit is not normal, most commonly seen in the sigmoid colon accumulation of fecal matter, tumors, hernia, etc., need to improve the examination, in order to clarify the cause of the disease. 1. Accumulation of fecal matter: It is mainly seen in patients with constipation, especially those who are used to high-fiber diet and less activity, and the stools are often dry, and prolonged constipation can lead to fecal matter accumulation in the sigmoid colon, which makes the left lower abdomen bulge more than the right lower abdomen. 2. Tumor: when there is a tumor in the left lower abdomen, it can also cause the left lower abdomen to bulge a little bit more than the right lower abdomen, such as sigmoid colon cancer, female patients can also be seen in the left ovarian cysts, ovarian cancer and ectopic pregnancy and other diseases. 3. Hernia: the left inguinal hernia is common in clinic, when the intra-abdominal pressure increases, the intestines and omentum will protrude from the left inguinal area, and the left lower abdomen will be more bulging compared with the right lower abdomen. It is recommended that the patient go to the hospital, complete the auxiliary examination, in order to clarify the cause of the disease, if necessary, by a professional physician to give appropriate treatment for the condition.