There are many causes of hidden pain in the left lower abdomen, and the common causes are the following possibilities: 1, intestinal diseases, if accompanied by bloating, diarrhea, fever, nausea, vomiting, mostly caused by acute gastroenteritis, constipation, intestinal obstruction, intestinal tumors or abdominal surgery to form adhesions, can cause hidden pain in the left lower abdomen. 2, urinary system diseases, such as urinary tract infections, stones, such as pyelonephritis, kidney stones, ureteral stones, can cause the above symptoms. 3, female patients with hidden pain in the left lower abdomen may be related to gynecological inflammation, tumors, such as pelvic inflammatory disease, adnexitis, ovarian cysts, torsion, teratoma, all can cause hidden pain in the left lower abdomen. If a woman is accompanied by menopause, not excluding the possibility of ectopic pregnancy, it is recommended that when there is hidden pain in the left lower abdomen, she should go to a specialist hospital for an abdominal ultrasound examination to make a clear diagnosis and provide symptomatic treatment so as not to delay her condition.