According to the description of the clinical syndrome and sign in the literature, the major syndrome of Xiao is similar to wheeze in the airway, but the syndrome of Chuan is similar to dyspnea.

• 哮证是气道中有喘呜音，喘证则包含呼吸困难，因此哮证是呼吸道的疾病，喘证则是多中急、慢性病中的一种症状。