| Back Pain | Kidney Pain |
| Usually affects the lower back | Felt higher up, below the ribs on one or both sides |
| Often linked to movement or posture | Usually constant and unrelated to movement |
| Improves with rest or pain relief | May persist despite rest |
| May spread to legs in spinal conditions | May radiate to the abdomen or groin |
| Rarely associated with fever | Often accompanied by fever, nausea, or urinary symptoms |