There are many causes of low back pain, and you can’t generalize about what kind of film to take. X-rays and CTs can be taken for trauma, and MRIs are usually preferred for spinal disorders. 1. If trauma is the cause of low back pain, we usually take X-rays to see if there is any fracture, and if further examination is needed, it can be combined with CT or 3D reconstruction of CT. 2. If the cause is highly suspected to be within the lumbar spinal canal. MRI is usually the preferred test. MRI shows the structure of the spinal canal well, and if there is a combination of bony structural changes, it can also be further identified by CT examination. With the occurrence of back pain, we must go to the regular hospital in time, after the doctor’s examination and then go to do the relevant film examination, do not take care of yourself, so as not to delay the condition.