You are working with Dr. Lee today. She hands you a triage note from the nurse regarding your next patient, Mr. Payne:Forty-five-year-old white male truck driver complaining of two weeks of sharp, stabbing back pain. The pain was better after a couple of days but then got worse after playing softball with his daughter. This morning his pain is so bad that he had trouble getting out of bed.Dr. Lee provides you some background information about low back pain.TEACHING POINTLow Back Pain Prevalence, Cost, & DurationLow back pain (LBP) is the fifth most common reason for all doctor visits. In the U.S., lifetime prevalence of LBP is 60% to 80%. The direct and indirect costs for treatment of LBP are estimated to be $100 billion annually. Fortunately, most LBP resolves in two to four weeks.Dr. Lee continues: "There are many causes for LBP. For presenting symptoms that have a broad differential diagnosis, I find it helpful to think of systems of etiologies in which diseases or conditions can be categorized."TEACHING POINTCommon Causes of Back PainMusculoskeletal (MSK) and Non-MSK Causes of Back PainMSK CausesAxial: Degenerative disc disease Facet arthritis Sacroiliitis Ankylosing spondylitis Discitis Paraspinal muscular issues SI dysfunctionRadicular: Disc prolapse Spinal