At present, most doctors and patients believe that a herniated disc compresses the nerves and causes low back pain, and the larger the herniated disc is, the more severe the low back pain is. In the absence of CT and MR imaging, doctors and patients were convinced of this statement, and even more so after the availability of CT and MR imaging, so doctors and patients tried every possible means to make the herniated discs disappear or shrink back through various treatments to achieve the elimination of patients’ clinical symptoms. However, over the past two decades of clinical practice, we have found that there is a discrepancy between fact and theory. Due to the advantages and special characteristics of our radiologists’ work, we receive dozens of patients who come for lumbar spine CT or MR examination because of lumbar leg pain every day, and we have studied the correlation between patients’ lumbar disc herniation and clinical symptoms of lumbar leg pain and found that: 1) the patients who have herniated discs and clinical symptoms of lumbar leg pain on preoperative CT or MR examination, and 2) the patients who have herniated discs and clinical symptoms of lumbar leg pain on postoperative imaging examination have no more lumbar leg pain, and 3) the patients have no more lumbar leg pain on postoperative imaging examination. After surgery, although the patient’s clinical symptoms of low back and leg pain disappeared, the performance of postoperative imaging was the same, and the herniated disc was still herniated and had not disappeared because of the surgery. 2, some patients in the imaging examination is bulging, although he did not see the protruding disc compression of the nerve, but can have and herniated disc and the same clinical symptoms of low back and leg pain, 3, we carried out CT-guided drug intervention since 1993, many of the majority of doctors believe that must be surgical treatment of intervertebral disc herniation patients (including the disc of the severe herniation or with free disc) through the intervention, the patient’s clinical back and leg pain. After treatment, the clinical symptoms of low back and leg pain disappeared, but the intervertebral discs of the patients were still found to exist in the imaging examination. 4, some patients CT, MR imaging examination shows the disc protrusion site and the patient’s clinical symptoms do not match; such as; disc protrusion on the left side of the lower extremity radiating pain in the right side; or some patients are L5-S1 disc protrusion, clinical symptoms are caused by L4-5 disc lesions. Therefore, clinical practice tells us: 1, clinical symptoms of low back pain patients, imaging (CT, MR) can be herniated disc! 2, Imaging examination (CT,MR) with disc herniation, clinical symptoms of low back pain can be no! 3.Imaging examination (CT,MR) has a herniated disc. Patients with no clinical symptoms of low back and leg pain should not worry about the herniated disc and do not need any treatment!