Scope of Application of TCM Syndrome Differentiation Methods

The theory and methods of syndrome differentiation in traditional Chinese medicine have been developed and enriched by medical practitioners throughout the dynasties and repeatedly verified through long-term clinical practice. To date, there are as many as eight commonly used methods, which can be broadly categorized into two types: syndrome differentiation for exogenous febrile wellness, primarily including syndrome differentiation of the six meridians (01.01), syndrome differentiation of the defensive, qi, nutrient, and blood phases (01.02), and syndrome differentiation of the triple burner (01.03); and syndrome differentiation for internal injury and miscellaneous wellness, mainly encompassing syndrome differentiation of qi, blood, and body fluids (02.01), syndrome differentiation of zang-fu organs (02.02), and meridian syndrome differentiation (02.03). As for the eight-principle syndrome differentiation and etiology-based syndrome differentiation, they can be applied to both of the aforementioned types of wellness.

The aforementioned syndrome differentiation methods have strong pertinence, so they have different scopes of application. However, they are interconnected and complementary to each other.

Generally speaking, the eight-principle syndrome differentiation serves as the outline for various syndrome differentiation methods, providing a highly generalized summary of the location and nature of a wellness, as well as the relative strength of vital qi and pathogenic factors. In terms of the wellness location, it distinguishes between exterior and interior. Regarding the nature of the wellness, it classifies it as cold or heat, and based on the relative strength of vital qi and pathogenic factors, it differentiates between deficiency and excess. Using yin and yang for overall classification, it divides syndromes into yin syndromes and yang syndromes. Therefore, all wellness can be analyzed through the eight-principle syndrome differentiation to reflect basic pathological changes.

Zang-fu syndrome differentiation is a method of analyzing and summarizing clinical signs of imbalance based on the framework of zang-fu organ pathologies. It specifically identifies which zang or fu organ is affected, whether the condition is cold or hot in nature, and whether it is of a deficient or excess type. Generally, all other syndrome differentiation methods must ultimately be applied to zang-fu syndrome differentiation to achieve an accurate assessment and enable targeted supports.

Differentiation of syndromes based on qi, blood, and body fluids serves as a supplement to syndrome differentiation according to zang-fu organs. It involves a comprehensive analysis and identification of some common issues in zang-fu organ syndrome differentiation. Since qi, blood, and body fluids are the material basis for the functional activities of zang-fu organs and are also the products of their physiological activities, they are closely related physiologically. In terms of pathology, zang-fu organ wellness and wellness of qi, blood, and body fluids often mutually influence each other. Therefore, this method of syndrome differentiation is frequently used in combination with zang-fu organ syndrome differentiation.

The differentiation of syndromes according to the six meridians, wei-qi-ying-blood, and the triple burner is mainly applied to exogenous wellness. These wellness are primarily characterized by fever, with an acute onset and rapid changes. For such wellness, these three methods of syndrome differentiation are highly targeted. Among them, the differentiation of syndromes according to the six meridians is mostly used for diagnosing and supports typhoid fever. It is a profound summary of the transmission and transformation patterns of wellness after the human body is affected by wind-cold, including their occurrence, development, and prognosis. Since exogenous wellness often damage the internal organs in the later stages, the differentiation of syndromes according to the six meridians is not only used for diagnosing and supports typhoid fever but also for the syndrome differentiation and supports of internal injury and miscellaneous wellness. The differentiation of syndromes according to wei-qi-ying-blood is primarily a method for diagnosing exogenous warm-heat wellness. Wei, qi, ying, and blood represent four stages of varying depths of wellness caused by the invasion of warm-heat pathogens into the human body, mainly divided into qi and blood aspects. Wei is the mild and superficial stage of qi, while ying is the mild and superficial stage of blood. However, they can sometimes also be regarded as four independent syndrome types in warm wellness. The differentiation of syndromes according to the triple burner also belongs to the syndrome differentiation methods for exogenous warm wellness but is mainly used for diagnosing and supports warm-heat wellness. Since the invasion of warm-heat pathogens into the human body often starts from the upper burner and gradually transmits to the middle and lower burners, the differentiation of syndromes according to the triple burner reflects the transmission and transformation patterns of damp-heat wellness.

As for syndrome differentiation based on meridians, it is currently mostly applicable in the clinical practice of acupuncture and moxibustion, and massage.

The above several syndrome differentiation methods have been summarized through long-term medical practice. They have different scopes of application and strong pertinence, but they are also interconnected and complementary to each other. Therefore, when learning various syndrome differentiation methods, it is necessary to organically connect them.

In addition, in a certain sense, etiology also falls within the scope of syndrome differentiation, known as “seeking etiology through syndrome differentiation” or “etiological syndrome differentiation”. It involves exploring the cause of a wellness based on its development process and clinical manifestations, so as to supports the wellness accordingly.