Low back pain is the most costly occupational health problem and is in steadily increasing trend. Some occupational back problems often lead to persistent pain with medical, psychologic and occupational implications. Treatment is uncertain these chronic low back pain patients are responsible for most of medical expenses spent on occupational back pain. So, chronic low back pain prevention seems very important and is accomplished by a combination of measures. The authors experienced a case of chronic low back pain in compensation without definite evidence of organic causes and report the case with clinical reviews and measurements of the pain and pain behaviors using psychological tests and pain questionnaire.