Backgrand and Aims PACU is a specific type of urticaria which characterized by the rapid onset of pruritus, erythema, and swelling after a cold stimulus.
背景与目的：PACU是由于人体受寒冷刺激后迅速出现红斑、风团伴瘙痒等表现的一类特殊类型的荨麻疹。
Studies show that the headache could be elicited only in hot weather; attempts to reproduce the pain during the winter were unsuccessful, even with use of a cold stimulus of the same temperature.
研究表明，这种头痛只在天气热时被诱发，而冬天试图诱发这种疼痛则不曾成功过，即便是用一样冰冷的温度去刺激。
The strong stimulus can also cause the abnormal stimulation of the cold receptors.
这种强烈的刺激也会导致冷感受器被异常激发。
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