《黄帝内经·素问·生气通天论》
如果阴不胜阳，阳气亢盛，就使血脉流动迫促，若再受热邪，阳气更盛就会发为狂症。
阴不胜其阳，则脉流薄疾，并乃狂。
If the yin cannot overcome the yang and the yang-qi becomes excessive, this will cause the blood vessels to flow rapidly. And if then exposed to additional heat, the yang-qi will increase even more, leading to a state of mania.