In most cases, pain in the lower left abdomen is not appendicitis, because the appendix is located at the junction of ileum and cecum, so it is usually located in the lower right abdomen. Sometimes the appendix is low and can be located in the pelvis, and sometimes the appendix is high and can be located under the liver. In most cases, the pain in the left lower abdomen is caused by intestinal diseases or urinary system diseases, and it needs to be clarified by going to the hospital for urological ultrasound and urinary routine. In some cases, the pain is caused by gynecological diseases, such as adenomyosis, fibroids, or ovarian cysts or torsion, which need to be clarified by gynecological ultrasound. Some patients have a localized inguinal hernia, which can be painful and accompanied by a mass formation. In a few cases, the appendix is too long and causes pain in the left lower abdomen.