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Sasang Constitution: A Traditional Korean Medicine Body-Type Theory

Sasang constitution is a body-type theory from traditional Korean medicine, distinct from mainstream East Asian medicine more broadly. Here is what it claims about its four types.

A 19th-century Korean innovation, not a shared East Asian theory

Sasang constitutional medicine was developed by physician Lee Je-ma and laid out in his 1894 text Dongyi Suse Bowon. It is specifically Korean in origin, distinct from mainstream Traditional Chinese Medicine, though it builds on shared Yin-Yang concepts.

Taeyang (Greater Yang)

Described as the rarest of the four types, with a strong upper body and head in the theory, and a personality marked as progressive, assertive, and outward-facing, alongside a comparatively weaker digestive system.

Taeeum (Greater Yin)

Described as the most common type, with a sturdier, larger frame in the theory, and a personality marked as patient, persistent, and ambitious, alongside a tendency toward slower metabolism that the theory says benefits from regular exercise.

Soyang (Lesser Yang)

Described as having a strong upper chest and quick energy in the theory, with a personality marked as warm, outgoing, and quick-moving, alongside a tendency toward impatience and digestive heat.

Soeum (Lesser Yin)

Described as having a smaller, more delicate frame in the theory, with a personality marked as careful, meticulous, and calm, alongside a tendency toward a weaker digestive system that the theory says benefits from warmth.

How it fits β€” and does not fit β€” within East Asian medicine

Sasang medicine draws on the same Yin-Yang framework used across East Asian medicine broadly, but its central claim is distinctive: that every person has one fixed, inborn constitutional type for life, which should shape their ideal diet and treatment. This differs from mainstream East Asian medicine's more fluid, situational pattern-based diagnosis.

Practiced in Korea today, not scientifically validated

Sasang medicine is a recognized specialty within Korea's licensed traditional medicine (Hanbang) system, taught at dedicated colleges, where practitioners typically assess a patient's body shape, facial features, and demeanor, sometimes alongside questionnaires. Modern biomedical science has not validated that four discrete constitutional types reliably predict health outcomes the way the theory describes.

Frequently Asked Questions

Is Sasang medicine practiced as licensed medicine in Korea?

Yes. It is one of the recognized specialties within Korea's traditional medicine (Hanbang) system, with dedicated training programs and licensed practitioners, existing alongside β€” not instead of β€” Western medicine.

Can a person's constitution change, or be a mix of types?

The theory holds that each person has one fixed, inborn constitution for life. In practice, though, even practitioners acknowledge that some people show mixed tendencies, which is part of why accurate diagnosis is considered genuinely difficult within the field itself.