Six Evils in Traditional Chinese Medicine: Wind, Cold, Dampness, Dryness, Heat & Summer-Heat

Traditional theory distinguishes the six qi (liù qì, 六气)—the normal influences associated with seasonal and climatic patterns—from the six yin (liù yín, 六淫), the term used when those influences are understood as excessive or otherwise pathogenic within that historical framework. “Pathogenic” here describes the tradition’s own conceptual model. It should not be read as a claim that each category is a modern, experimentally established pathogen.

The words are compact labels for qualities and environmental associations. They do not establish what is happening in an individual, and the same label should not be treated as a diagnosis. The World Health Organization’s International Standard Terminologies on Traditional Chinese Medicine (2022) is useful for traditional nomenclature. A Hong Kong Chinese Medicine Regulatory Office public education reference lists the six qi and six xie in its opening terminology section; that nomenclature is the scope of its use here.

These are concise traditional associations for learning terminology. They are not observations about a reader or a guide to identifying a condition.

Wind represents movement and variability in this traditional vocabulary. It is commonly associated with spring, a season understood as shifting and dynamic. In broader TCM theory, Wind is one of the six qi categories and may be discussed in relation to other environmental qualities. This is a conceptual description, not a claim that literal wind has a specific clinical effect.

Cold is associated with winter and a traditional quality of contraction. The term expresses how the theory organizes cold environmental conditions and their perceived character. It belongs to the same six-category framework, but its role here is descriptive and historical: it does not identify a person’s health state or establish a disease mechanism.

Summer-Heat names a distinct seasonal influence associated with summer and intense, rising warmth. Traditional descriptions often consider it alongside Dampness, reflecting the humid conditions that can accompany summer in some environments. It is not simply another spelling of Fire/Heat: Summer-Heat is explicitly seasonal, while Fire/Heat is a broader category in the theory.

Dampness is linked conceptually with humidity and moist surroundings. Its traditional descriptive qualities include heaviness and a tendency to linger. It may be paired conceptually with other influences, including Summer-Heat, but these relationships belong to traditional theory. They are not a way to infer a constitution, condition or cause from someone’s birth chart.

Dryness is traditionally associated with autumn and conditions understood as lacking moisture. The concept gives the six-category model a way to describe a different environmental quality from Dampness. Seasonal associations are broad conceptual correspondences, not fixed rules about weather, a person’s experience or health.

Fire/Heat describes intense warmth and an ascending quality in traditional accounts. The terms 火 and 热 can appear together or in related formulations, and usage varies with context. Although it shares warmth with Summer-Heat, Fire/Heat is not identical to the seasonal Summer-Heat category. Both remain vocabulary within historical TCM theory rather than modern pathogen classifications.

These traditions may share Chinese medical and cosmological vocabulary, but their conceptual roles differ. Birth information cannot identify a person’s Six Evils, and the Biohack.BaZi calculator does not diagnose them. Continue with the distinct TCM body-constitution overview, the BaZi Five Elements guide, or the Biohack.BaZi methodology.