从前阴排出气体，所以称为“阴吹”。从后阴排出气体，是大肠的正常通道，所以称为“正喧”。这是指胃中的气向下泄出，导致通过前阴的旁道吹出，同时又通过后阴的正道发出喧响。这是因为胃能受纳食物，脾能消化食物，但因为大肠津液干燥导致大便干结，致使谷气壅实。大肠正道传导谷气而力量不足，于是气与水液代谢产物一起从小肠的岔路迸发出来。实证会导致排气，如果不使大便通畅，让谷气下行平稳，是不可行的。然而如果投用攻下的药剂，是责备脾胃无辜，必然导致反而不能进食且出现胀满。所以使用润滑肠胃的猪膏（猪油），滋养血液的发灰（乱发烧成的炭），熬制成煎剂服用，那么干结的大便得到滋润而下行，谷气得以平复，正喧的症状自然也会停止，哪里还会有阴吹呢？钱塘李氏认为，正喧就是阴吹的喧响。李徐氏将本文中的“正喧”改为“正结”，都失之偏颇。
Gas discharged from the anterior orifice is therefore called "Yinchui" (Yin blowing). Gas discharged from the posterior orifice follows the normal path of the Large Intestine, hence it is called "Zhengxuan" (Normal rumbling). This refers to the Qi in the Stomach descending and leaking out through the collateral pathway of the anterior orifice, while simultaneously producing rumbling sounds through the normal pathway of the posterior orifice. This occurs because the Stomach receives food and the Spleen transforms it; however, due to dryness of the fluids in the Large Intestine resulting in constipation, the Grain Qi becomes excessive. The normal transmission of Grain Qi in the Large Intestine is insufficient, causing Qi and water metabolism products to burst forth through the branching pathways of the Small Intestine. Excess conditions lead to flatus; without promoting bowel movement to allow Grain Qi to descend smoothly, the condition cannot be resolved. However, if purgative agents are administered, this unjustly burdens the Spleen and Stomach, inevitably leading to an inability to eat and abdominal distension. Therefore, Pig Fat (Zhogao) which lubricates the intestines and intestines, and Hair Ash (Luanfa) which nourishes blood, are boiled together to make a decoction. Thus, the dryness and hardness are moistened and relieved downward, Grain Qi is pacified, and the symptoms of Zhengxuan will cease naturally. How could Yinchui persist? Mr. Li of Qiantang stated that Zhengxuan is merely the rumbling sound associated with Yinchui. Mr. Li Xu changed "Zhengxuan" in the original text to "Zhengjie" (Normal knotting), both interpretations being incorrect.