Every year in early August, the Korean calendar announces Ipchu (입추, 立秋) — the start of autumn — and every year it lands in the middle of the hottest stretch of the summer. People laugh at the name. But the start of autumn is not a forecast of cool weather. It marks the moment the season changes direction, and for the two Wood constitutions of Eight Constitution Medicine (ECM), Hepatonia and Cholecystonia, that change of direction matters more than the thermometer.
In Summary
- The start of autumn (Ipchu) is a turning point in the sun’s path, not a promise of cool air. The heat peaks around it because energy gathered since early summer has only just stopped accumulating.
- From this point, the season’s qi turns from spreading outward to gathering inward.
- Hepatonia and Cholecystonia are the constitutions most troubled when qi gathers inward, so the start of autumn is when their seasonal care should begin — weeks before it feels cool.
- Two simple steps: cut back on cold food and drink, and cut back on air conditioning (or wear an extra layer under it).
Why the Start of Autumn Is Still Hot
The 24 solar terms divide the sun’s yearly path along the ecliptic into 15-degree steps, beginning at the spring equinox. The start of autumn sits between the summer solstice, when daylight is longest, and the autumn equinox, when day and night are equal. It is the first term that leans toward the equinox. It means the earth, warmed by the sun all summer, is about to begin cooling — not that it already has.
In Korean Traditional Medicine (KTM), the traditional healing system of Korea also known as Hanbang (한방), heat and cold are read as the gathering and density of qi (氣). Qi accumulates first; heat follows. From the start of summer through the Great Heat, the sun’s energy has been piling into the land. That is why the days around the start of autumn are often the hottest of the year: the accumulation has only just peaked.
Yet daylight has been shrinking since the solstice and is now approaching the equinox balance. From here the sun works in the direction of autumn. Hence the name — and hence the gap between the name and the weather.
I often think of it like studying. You do not get better marks the day you start working hard. The direction changes first; the result shows up later.
The Turn Inward and the Wood Constitutions
Hepatonia and Cholecystonia are the two Wood constitutions — both Taeeumin in the older Sasang system. Their liver–gallbladder axis is constitutionally dominant, and their characteristic trouble comes when qi gathers inward toward that axis and cannot get back out. In ECM, “strong” does not mean “safe” — the dominant axis carries the most qi and tips most easily into excess.
What these types need is an outward, dispersing movement — which is exactly what summer supplies. The start of autumn is when the summer sun’s spreading force changes course and begins drawing qi inward. The dispersing force they rely on shrinks; a gathering, astringent force takes over.
Right now, because it is still hot, that inward pull feels small. But it has reversed the trend, and in that sense it is powerful. Its effect simply takes time to show. In my clinical experience, many Wood-type patients feel the season’s toll not in midwinter but in the weeks when the weather first turns — and some find this transition harder than the cold itself. That is a tendency, not a rule: plenty of Hepatonia and Cholecystonia sail through autumn, and plenty of other types struggle in it for other reasons.
What to Do Before It Feels Like Autumn
The aim is simple: keep qi from flowing excessively inward. Two small adjustments do most of the work.
- Cut back on cold food and drink. Iced drinks and cold dishes reinforce the very inward, contracting movement the season is starting to impose.
- Cut back on air conditioning. If you cannot avoid it — an office, a train — wear an outer layer rather than letting chilled air sit on your skin all day.
Neither sounds like much. But started at the start of autumn rather than at the first cold snap, they help protect stamina through autumn and winter and lower the odds of the respiratory illnesses that tend to follow the season’s turn.
As the weather does cool, the same logic continues: warm, cooked food, and moderate sweating — a brisk walk, a warm bath — to let gathered qi move outward again. Moderate is the important word. Sweat heavily and then sit in a draught, and you invite exactly the cold you were trying to avoid. Dry off and stay warm afterwards.
A note of caution: none of this is a way to work out your constitution. Feeling worse as autumn begins does not make you a Wood type. Constitution is determined by proper diagnosis, not by which season bothers you.
Summary
The start of autumn is hot because accumulated summer energy has only just peaked — but the season’s direction has already turned inward. For Hepatonia and Cholecystonia, constitutions troubled when qi gathers inward, that turn is the signal to begin seasonal care: less cold food, less air conditioning, warm meals and moderate sweating as the weather cools. Start early, while it still feels like summer.
Related reading: Jangha, the Fifth Season: What Korean Medicine Sees Between Summer and Autumn · Baths and Colds by Constitution: Who Should Sweat It Out, and Who Shouldn’t
