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Donguisusebowun(東醫壽世保元) and Sasang-constitutional-medicine(四象醫學) Lee Je Ma systemized Sasang-constitutional-medicine(四象醫學) by writing the book Donguisusebowun(東醫壽世保元). Sasang(四象) is a philosophic term which comes from the theory of the Great Absolute which explains that everything in the universe is created under the fundamental rule of relativity of Yin-Yang(陰陽) and Sasang(四象). Under this theory, human's organs are formed by the weakness or excess of Yin and Yang. According to this, the human body can be classified into four constitutions of Taeyang(太陽), Soyang(少陽), Tae-eum(太陰), So-eum(少陰) according to the individual's temperament and nature.

This means that treatment should be practiced according to the constitution also. The theory of Sasang-constitutional-medicine(四象醫學) is estimated as an epochal theory not relying on the existing theory of Yin-Yang(陰陽) and the five elements(五行) and instead focused on the patient's constitution. Like his saying "Though my life ends now, Sasang medicine will be the mainstream medicine after 100 years." numerous Korean doctors succeeded his theory and thoughts, and are applying them to clinical practice.

His pen name is Dongmoo. He founded the theory of Sasang constitutional medicine. When young, he journeyed around the country and foreign countries and widened his experience and knowledge. After this, he came back to his hometown and passed the recruit test for military officers.

Lee Je Ma founded Sasang constitutional medicine by applying the Sasang which comes from the theory of the Great Absolute which is consisted of Taeyang, Soyang, Tae-eum, So-eum, and wrote Donguisusebowun when he was 58.

Category	Taeyangin	Taeumin	Soyangin	Soeumin
Percentage of population
Appearance	More inclined to lose weight - - - - - - - - - - Person with a large head and small hips - - - - - - - - - - The upper body is well developed.	Exercises are better than loss of weight. - - - - - - - - - - Tall with a nice figure and slender neck	The upper body, especially the chest, is well developed.	The lower body is well developed. - - - - - - - - - - Large hips and narrow shoulders
Personality	Very brave and active with masculine characteristics - - - - - - - - - - Obstinate and lacking precision and deliberation	Calm and faithful with strong sense of achievement - - - - - - - - - - Conservative and not challenged	Very honest and brave with strong sense of service - - - - - - - - - - Impatient and intolerant	Gentle and composed - - - - - - - - - - Introspective, inactive and not progressive
Health management		Excessive perspiration - - - - - - - - - - Hard labor stimulates excessive perspiration	Prefers the cold due to body heat - - - - - - - - - - Excess ice cream diet does not lead to any stomach disorders.	Better to consume more warm foods than cold - - - - - - - - - - Better digestion leads to better health