The following are common causes of hidden pain in the left lower abdomen: 1. Adnexal inflammation: Female patients can suffer from left-sided adnexal inflammation, causing local hidden pain symptoms, such as left ovarian cysts or fallopian tubes with chronic inflammation, which may cause pain in the patient’s left abdomen, accompanied by radiating pain in the lower back, and the specific cause of the pain can be clarified through gynecological ultrasound, and if necessary 2, constipation: elderly male patients with prolonged constipation will cause more feces and gas to accumulate in the colon, causing intestinal dilatation, resulting in left lower abdominal pain symptoms. Patients can clarify the severity of fecal stagnation through colonoscopy, and promote the discharge of feces in the body by taking oral lactulose and Benadryl tea to improve the symptoms of lower left abdominal pain caused by intestinal stagnation.