Hidden pain in the stomach below the left abdomen may be related to urinary tract infections, ovarian diseases, digestive system diseases, peritoneal diseases and so on. 1. Urinary tract infections: urinary tract infections such as pyelonephritis can also have vague pain in the left lower abdomen. 2. Ovarian diseases: Ovarian diseases, such as inflammation and tumor, cause the left fallopian tube and ovary to be infected by pathogenic bacteria and inflammation, which can also cause hidden pain in the left lower abdomen. 3. Digestive system diseases: Inflammation and tumor of the colon caused by various reasons, such as sigmoiditis. May be due to viral, bacterial, fungal, parasitic infections, resulting in inflammation of the intestines, can also appear in the left lower abdomen hidden pain, may be accompanied by diarrhea and other symptoms. 4. Peritoneal diseases: such as mesenteric sebaceous membrane inflammation, peritonitis, etc., may also appear as vague pain in the lower left abdomen. Hidden pain in the lower left abdomen can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or therapy.