| Summary: | Objective: To explore the value of ear morphological inspection in identifying the nine constitutions of traditional Chinese medicine (TCM) by analyzing the correlation between these two research objects. Methods: A cross-sectional research design was employed. The participants' ear morphology was determined using the Ear Morphology Inspection Information Evaluation Form, while constitution was assessed using the Constitution in Chinese Medicine Questionnaire. Data were statistically analyzed, and one-way and multi-factor logistic regression analyses were conducted. Results: Among 888 participants, 270 (30.41%) had a balanced constitution, and 618 (69.59%) had different biased constitution types. The analysis revealed that thick auricles (P < .05) and a moderately sized left earlobe (P = .010) were protective factors, while obtuse earlobes (P < .05) were risk factor for balanced constitution. Auricles close to the temple (P < .05) was a protective factor, while no Frank's sign in earlobes (P < .05) and obtuse earlobes (P < .05) were risk factors for qi-deficiency constitution. Clear structure of the helix (P < .05), no Frank's sign (P < .05), and a visible half left helix (P = .024) were risk factors, while auricles close to the temple (P < .05) and a triangular right ear apex (P = .029) were protective factors for phlegm-dampness constitution. No Frank's sign (P < .05) and moderate tragus shape (P < .05) were risk factors for qi stagnation constitution. Triangular ear apexes (P < .05), a left auricle close to the temple (P = .002), and moderate position of auricles (upper edge of the auricle levels with the top of eyebrows, P < .05) were protective factors for qi stagnation constitution. Conclusion: A correlation between ear morphology and TCM constitutions may exist. Ear morphology may be used as reference values for the identification of TCM constitutions.
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