A: The necessity of proving ‘causation’ in physical harm cases uniquely defines the work of a personal injury lawyer because it requires them to establish a direct and unbroken link between the defendant’s actions and the plaintiff’s specific injuries. Unlike legal fields where causation might be simpler (e.g., a breach of contract causing financial loss), personal injury lawyers must often demonstrate through expert testimony that a specific negligent act directly led to specific physical ailments, distinguishing their complex evidentiary burden.