A nurse is caring for a client who has low back pain. Which of the following should the nurse recognize is a mechanical cause of low back pain?

Choice A reason: A herniated disk is a mechanical cause of low back pain resulting from displacement of intervertebral disc material, which can compress spinal nerves and cause localized or radiating pain. Choice B reason: Meningitis is an infectious cause of back pain, often accompanied by fever, neck stiffness, and neurological symptoms. It is not mechanical in origin. Choice C reason: Angina is cardiac-related chest pain and does not cause mechanical back pain. Referred pain may occur but is not due to musculoskeletal dysfunction. Choice D reason: An abdominal aneurysm may cause referred back pain due to pressure on surrounding structures, but it is vascular in origin and not mechanical.