Married women with vague pain in the left lower abdomen are considered to be related to diseases of the reproductive, digestive, and urinary systems. 1. Reproductive system diseases: (1) left adnexitis: if the patient is also combined with leucorrhea, fever and other discomforts, be alert to the possibility of left adnexitis. (2) Left adnexal cyst: for patients with left adnexal cyst, if there is a sudden onset of pain in the left lower abdomen, it is necessary to be alert to the possibility of cyst torsion. (3) Ectopic pregnancy: for patients who have had tubalitis in the past, if they have had sex recently or have symptoms of menopause, they should be alert to the occurrence of ectopic pregnancy. 2. Digestive system: if the patient is also combined with diarrhea, not thinking about food, stools are not shaped or constipation and other discomforts, we should be alert to the occurrence of gastroenteritis, proctocolitis. 3. Urinary system: if the patient at the same time combined with frequent urination, urinary urgency, urinary pain, be alert to the occurrence of urinary tract infection; if the patient found in the urinary system ultrasound high-density shadow, accompanied by hematuria and other discomfort, be alert to the occurrence of urinary stones. For women who have hidden pain in the left lower abdomen, which may be related to the above factors, it is recommended that the patient go to a regular hospital to improve the urine routine, ultrasound and other related examinations, to clarify the cause of the disease under the guidance of the doctor to actively treat.