Hidden pain in the left lumbar region is divided into physiological and pathological, pathological causes of orthopedic diseases, urinary system diseases and gynecological diseases, etc., can not be summarized in three diseases. 1. Physiological: If you have recently carried out heavy physical labor of intense intensity, you may have hidden pain because the lumbar force exceeds the load of your own body, resulting in injury to the muscles and fascia, etc.; there are also reasons such as standing for a long period of time and incorrect posture, etc., which can lead to lumbar pain. All of the above are normal physiological phenomena and do not require additional special treatment. 2. Pathology: the most common causes of left-sided lumbar pain are orthopedic diseases, such as spinal stenosis, vertebral fracture, spinal tuberculosis and spinal subluxation, etc.; there are also urological diseases, such as kidney stones, pyelonephritis and ureteral stones, which can also cause pain in the lumbar region due to the site of the lesion. There are also gynecological diseases such as cervical cancer that can produce low back pain due to radiating pain. If you suspect that the symptoms are pathologic, it is advisable to go to the hospital promptly.