In order to evaluate the effect of the lumbar epidural steroid injection in the low back pain and/or radicular pain. We studied 66 patients who were treated and followed for an average of 8.6 months. In the initial evaluation, main pain sites were as follows: low back pain in 41 patients, buttock pain in 7 patients, and leg pain. In 18 patients. Immediate response and delayed response in the patients were studied. Immediate response within 1 day after injection revealed the following : dramatic improvement in 3.0%;some improvement in 56.1%; no improvement in 27.3%; and more aggravated in 13.6%. Delayed response after 1 month revealed the following : 15.2% continuously maintained improvement; 9.1 showed progressive improvement;36.4% experienced recurring pain; 27.3% had no improvement; and 10.6% had aggravating pain. The effect of the lumbar epidural steroid injection was not affected by the severity of pain in the initial evaluation. Better improvements were noted in patients who suffered radicular pain than those who suffered low back or buttock pain. Good prognostic factors were young age and male. Complications that the patients suffered were transient injection pain(6), edema of the face or extremity(10), transient leg weakness(5) and dural puncture(1). The number of patients who wanted to recommend this procedure to others were 22(33.3%). In conclusion, epidural steroid injection was one of the methods in the management of the patients who suffered low back pain and/or radicular pain and had no effect by any other therapies.