Differential Diagnosis and Medical Screening in Physical Therapy Practice Exam

Red flags in low back pain are signals used to screen for potentially serious conditions and prompt further evaluation. In clinical practice, many patients with back pain will endorse at least one red-flag feature on history or exam—examples include aging over 50, fever or chills, unexplained weight loss, night pain, a history of cancer, immune suppression, recent significant trauma, or new neurologic symptoms. These factors aren’t diagnostic on their own, but their presence raises the risk that something more serious could be going on and therefore warrants closer assessment or referral. Because red flags cover a broad range of potential issues, it’s common for a patient with low back pain to have at least one; that’s why the statement is considered true in the context of screening. The point isn’t that red flags confirm a specific disease, but that they guide the need for additional evaluation to avoid missing serious pathology.