Which symptom is documented as associated with the patient's low back pain?

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Bladder dysfunction signals possible nerve involvement in the lower spine, specifically compression of the sacral nerve roots as seen with cauda equina syndrome. When those nerves that regulate bladder control are affected, urinary retention or incontinence can occur, sometimes alongside saddle anesthesia or leg weakness. This combination is a critical red flag that prompts urgent imaging and neurosurgical evaluation to prevent permanent neurologic damage. Other symptoms like fever, nausea, or joint pain aren’t direct indicators of acute nerve compression in the lumbar region, so they don’t fit as the documented associated symptom in this context.