A number of post-traumatic pain syndromes may be grouped as causalgia or mimocausalgia. These are important entities and should be well known to most disciples of medicine. Our concern is the early recognition of patients whose complaints have an organic basis but whose physical signs are not of sufficient degree to make this fact readily apparent. These patients are often misunderstood and discredited. They are all too often mismanaged or neglected for so long that the underlying pathologic physiology secures supremacy over normal function. Recognized and treated properly by means of sympathetic ablation, either medical or surgical, the vast majority of symptoms can be relieved. The extremities then can be rehabilitated by appropriate measures.