Many readers tell me they don’t know their constitution, and wonder whether my posts on “disease X in constitution Y” have anything to offer them. They do. Knowing how constitution and disease relate is useful even if you never learn your own type — because each constitution is really a clear picture of what happens when a particular organ weakens or tips into excess.
In Summary
- Sasang medicine shares its theoretical base with classical KTM; it differs in method, analysing the body’s form first rather than sorting functions by the Five Phases.
- For students: accept first and understand later, and build a solid foundation in yin–yang, the Five Phases and organ theory.
- Illness does not follow constitution alone. A Soyangin’s strong digestion can still weaken until a spleen-supporting formula is what works best.
- Each constitution is a case study of one organ’s typical trouble. To understand what a weak, cold large intestine does to the body, study Cholecystonia.
- So posts about “constitution Y” often help anyone whose organ is in the same state — whatever their type.
Sasang and Classical KTM: Same Root, Different Method
In Korean colleges of Korean Traditional Medicine (KTM), the traditional healing system of Korea also known as Hanbang (한방), students usually meet Sasang constitutional medicine in their fourth or fifth year. Sasang shares the same theoretical foundation as earlier KTM; what differs is the method it mainly uses:
- Classical KTM uses the Five Phases (오행) as its yardstick, dividing physiological functions into five and treating the related organs.
- Sasang medicine uses the four constitutional types as its yardstick, analysing the body’s form first and treating by regulating the functions that arise from that form.
Students often find Sasang medicine strange and difficult, but its essence is the same.
A Short Study Guide for Students
- Accept first, understand later. The essence is the same as what you already know. If you refuse to accept it at the start, you cannot get far enough to understand it, so it is better to let it in and come back to it. In my view, the existence of constitution has already been established well enough in practice.
- The foundations decide how deep you go. People with a solid grounding in yin–yang, the Five Phases and organ theory (장상학) are the ones who come to understand Sasang medicine and Eight Constitution Medicine (ECM) fully. The further you go in constitutional study, the clearer that becomes.
Illness Does Not Follow Constitution Alone
Disease does not only arrive along constitutional lines. Soyangin — Pancreotonia and Gastrotonia — have abundant spleen–stomach qi, and it is unusual for their appetite to be dampened. Yet over a lifetime even a Soyangin’s spleen and stomach can weaken, and there are times when a spleen-supporting formula such as Bojung-ikgi-tang (보중익기탕) is exactly what works best. In ECM, “strong” does not mean “safe” — and a strong organ can also simply wear out.
Why the Constitution–Disease Picture Helps Everyone
Knowing how constitution relates to disease helps you understand how the organs and tissues of the body work.
Suppose you want to know what changes happen in the body when the large intestine weakens and causes illness. The best place to look is Cholecystonia, the constitution whose large intestine is the weakest. (That is a description of the constitution’s tendency, not a prediction that every Cholecystonia’s illness will start there.) When I write about Cholecystonia, I have in mind people whose health suffered because their large intestine became cold and sluggish.
Understanding constitution and organ function widens your view of your own body enormously. When the large intestine becomes cold and sluggish, the common consequences go well beyond bowel disease: fatigue and weakness, various neuropsychiatric problems such as low mood, low back pain, genitourinary problems, and headache. These are tendencies, not predictions for any individual — and any of them deserves proper evaluation in its own right.
Of course, when you sense something is wrong, an expert’s opinion is best. But it is still worth being able to think through what might be going on yourself.
Why I Write by Constitution
There are several reasons I write mostly about constitution. One is that I teach disease patterns, and it is easier to explain a disease when the circumstances in which it arises are narrowed down. So when I write “disease X in constitution Y,” I am often describing the state of an organ rather than the constitution as such. If the disease is relevant to you, the post may help even if it is not your constitution.
I said you don’t need to know your constitution — but knowing it is a great help in managing your health. It will not happen in the near future, but once the tools for diagnosing constitution become more advanced and standardised, I think a time will come when many people understand their constitution and manage their health accordingly. I look forward to a day when constitutional diagnosis is as routine as a national health check-up.
Summary
Each constitution is a clear case study in how one organ’s weakness or excess shows up in the body. You can learn from those case studies whether or not you know your own type — and when you do learn it, they become even more useful.
Related reading: Digestion and the Cholecystonia Constitution · Why a Basic-Science Professor Writes About Constitution
