Every year around this time, many of us notice the same three things at once. Skin that feels tight after a shower. A nose that is dry or bleeds a little in the morning. And bowels that have slowed down for no obvious reason. Most people treat these as three separate problems. Chinese medicine has treated them as one for centuries, and it has a name for it: 秋燥 (qiū zào), autumn dryness.
What surprised me when I went back to the sources is that the Huangdi Neijing, the founding text of Chinese medicine, largely missed it. The idea of autumn dryness as its own condition was argued into the tradition later, by a physician who thought the classic had made a mistake.
In Part 1 we covered what to eat to match autumn’s inward energy. This article is about the season’s defining challenge, dryness: where the idea came from, what modern research says about dry air and the body, and which moistening foods have real evidence behind them.
Dryness, the Forgotten Pathogen
Chinese medicine describes six climatic influences (六气): wind, cold, summer heat, damp, dryness and fire. In balance they are just weather. In excess, or when the body cannot adapt, they become pathogenic (六淫). Each season has its dominant one, and autumn’s is dryness (燥, zào).
Here is the odd part. The Neijing’s famous nineteen principles of disease mechanism (病机十九条, in Su Wen chapter 74) list conditions belonging to wind, cold, damp, heat and fire. Dryness is not among them. And Su Wen chapter 5 says 秋伤于湿，冬生咳嗽: “injured by damp in autumn, one coughs in winter.” Damp, not dry, in the season that later physicians would call the driest of the year.
Two later physicians set out to fix this.
In the Jin dynasty, Liu Wansu (刘完素) added a twentieth line in his Suwen Xuanji Yuanbingshi (《素问玄机原病式》): 诸涩枯涸，干劲皴揭，皆属于燥. Everything rough and withered, dry and stiff, cracked and peeling, belongs to dryness. It is one of the best clinical descriptions of dry skin I have read in any language.
Then in 1658, Yu Chang (喻昌) wrote an essay called On Autumn Dryness (《秋燥论》) in his Yimen Falü (《医门法律》). He was blunt about it:
《内经》病机一十九条，独遗燥气。
Of the Neijing’s nineteen disease mechanisms, dryness alone was left out.
He went further and argued that the line “injured by damp in autumn” had been a misreading that generations of scholars simply copied. His corrected sequence was 春伤于风，夏伤于暑，长夏伤于湿，秋伤于燥，冬伤于寒: wind in spring, summer heat in summer, damp in late summer, dryness in autumn, cold in winter.
I tell this story because I think it shows the tradition at its best. A physician looked at his patients, looked at the classic, saw they did not match, and said so in writing. That is the same spirit I try to bring to these articles.
Later physicians divided autumn dryness into two kinds, which is still useful:
- Warm dryness (温燥), early autumn, when the air is dry but the heat of summer lingers. Dry throat, thirst, a scratchy cough, sometimes a sore throat.
- Cool dryness (凉燥), late autumn, when the air is dry and cold. Dry nose and skin with some chill, a tight dry cough, little sweating.
If you want to know how to tell a dry cough from a hot or cold one, I set that out in a table in the Lung article.
Why the Lung and the Bowel Dry Out Together
Later Chinese medicine (the phrase is Qing dynasty, not classical) calls the Lung 娇脏, the delicate organ, because it is the one most exposed to the outside air. It is said to love moisture and dislike dryness (喜润恶燥).
The traditional physiology goes like this. The Lung takes fluids and spreads them upward and outward like a fine mist to the skin, the nose, the throat and the upper body. It then sends fluids downward to the Large Intestine, its paired organ (肺与大肠相表里), keeping the stool soft enough to pass.
When dryness wins, both ends suffer at once. You get the dry skin, the dry nose, the dry throat and the unproductive cough at the top. And you get hard, dry stools at the bottom. That is why the tradition treats “autumn constipation” and “autumn cough” with many of the same foods.
What the Science Says About Dry Air
Modern research does not use the word 燥. But it has a lot to say about low humidity, and most of it points in the same direction.
Dry air and the airway. In 2019, Akiko Iwasaki’s lab at Yale published a study in PNAS housing mice at low versus normal relative humidity and then exposing them to influenza. In dry air, three defences weakened at once. The cilia that sweep mucus and viruses out of the airway cleared less effectively. Damaged airway cells repaired more slowly. And interferon signalling, the early alarm system cells use to warn their neighbours about a virus, was impaired. The mice in dry air got sicker.
Two honest caveats. These were mice, and Iwasaki herself framed the result as a possible mechanism for flu seasonality if it holds up in humans. Humidity is also only one reason flu peaks in the colder months. But it gives a concrete mechanism to the old idea that dryness weakens the Lung’s defences.
Dry air and the skin. A 2016 review in the Journal of the European Academy of Dermatology and Venereology pulled together the evidence on humidity, temperature and skin. The conclusion was that low humidity and low temperature both weaken the skin barrier, make skin more sensitive to irritants, and are linked to flares of eczema. The winter pattern of cracked hands and itchy shins is well documented.
This is where Liu Wansu’s line, “cracked and peeling belongs to dryness,” reads almost like a dermatology abstract.
The indoor season. One thing the old texts could not anticipate: central heating. Once the heat goes on, indoor air can become far drier than the air outside. Public health guidance generally suggests keeping indoor humidity around 30% to 50%, which is a useful range to aim for, especially in the bedroom.
Moistening Foods: What Has Evidence and What Is Tradition
Chinese dietary therapy has a whole category of foods called 润燥, “moistening dryness.” Here is how I would sort them, being clear about which claims have modern support.
Honey: good evidence for cough
Honey (蜂蜜) is a classic moistening food for the Lung and the bowel. It is also one of the few traditional remedies with a Cochrane review behind it.
The 2018 Cochrane review of six randomised trials in 899 children found that honey probably reduces cough frequency more than no treatment or placebo, and works about as well as dextromethorphan, a common over-the-counter cough ingredient. The evidence was rated low to moderate certainty, most children were treated for only a night or two, and the benefit beyond three days was not clear. That is a real, modest finding, and more than most home remedies can claim.
One absolute rule: never give honey to a baby under 12 months, because of the risk of infant botulism.
Pear: tradition strong, evidence thin
Pear (梨) is the food Chinese families reach for first when a dry cough starts. The classic preparation is a whole pear steamed or baked with a little rock sugar or honey, sometimes with a few slices of ginger for cool dryness, or with tremella for warm dryness.
It is a lovely remedy. But I want to be honest: I have not found good-quality human trials showing pear itself relieves cough. It is warm, soothing, easy to digest and hydrating, which is a sensible thing to eat when your throat is dry. Treat it as comfort food with a long tradition rather than a proven treatment.
Prunes and fibre: good evidence for the bowel
For autumn constipation, the most tested moistening food is not traditionally Chinese at all. Prunes (dried plums) have been studied properly.
A 2019 randomised trial in Clinical Nutrition gave 120 adults with low fibre intake and infrequent bowel movements either 80 g or 120 g of prunes a day with water, or water alone, for four weeks. Both prune groups had heavier stools and more frequent bowel movements than the water group, with the larger dose showing the biggest increase in stool weight. The honest footnotes: whole-gut transit time did not change, flatulence went up, and the trial was funded through a PhD studentship from the California Dried Plum Board, which the authors disclosed.
Plums are also one of the sour foods of autumn from Part 1, so they do double duty.
Sesame, nuts and seeds: sensible and traditional
Black and white sesame (芝麻), walnuts (核桃), almonds, pumpkin seeds and figs (无花果) are all traditionally used to moisten the intestines. Sesame in particular is a classic for dry, hard stools in older people. The modern explanation is ordinary nutrition: they add fat and fibre, both of which help stool pass. Tahini and nut butters are an easy way to eat more of them.
Tremella, lily bulb and lotus root: traditional
Tremella (银耳, white fungus), lily bulb (百合) and lotus root (莲藕) are the white, moistening foods of the Chinese autumn table, often cooked together in a sweet soup with pear and a few goji berries. They are gentle, soothing and hydrating. The research on them in people is limited, so I recommend them as good food rather than as remedies.
Seaweed: moistening, with two cautions
Seaweed is traditionally salty and moistening and helps move the bowels. Two cautions. Some seaweeds, especially kelp (kombu), can contain very high levels of iodine, which is a concern for people with thyroid conditions if eaten often. And hijiki can contain high levels of inorganic arsenic; several food safety agencies advise avoiding it. Nori and wakame in normal food amounts are the easier choices. The tradition also says to skip seaweed if you already have loose stools.
Water, soup and congee
Finally, the obvious one. Dryness is partly a fluid problem, and fluid comes most easily from soups, congee and warm drinks, which is also exactly what the autumn kitchen from Part 1 recommends. Warm water, broths and teas count.
What Makes Dryness Worse
The flip side of moistening is avoiding the things that dry you out further.
- Dry, baked and crunchy snacks as a staple. Crackers, chips, toast and popcorn every evening.
- Very spicy food and a lot of alcohol. Both are traditionally drying and heating, and alcohol is a diuretic.
- Very hot showers. They strip the skin’s oils. Lukewarm and brief is better in dry weather.
- Heated rooms with no humidity. Especially overnight, with the mouth open during sleep.
- Late nights. In Chinese medicine, staying up late consumes yin, the body’s cooling, moistening reserve. This is one reason the Neijing asks us to go to bed earlier in autumn.
A Simple Autumn Dryness Routine
- Eat something moistening every day. A baked pear with honey, a spoon of tahini, a few walnuts, a sweet soup with tremella and lily bulb.
- Keep a few prunes or plums on hand if your bowels slow down in autumn.
- Drink warm fluids through the day, not just when you feel thirsty.
- Moisturise straight after bathing, while the skin is still damp.
- Run a humidifier in the bedroom if the air is dry, aiming for roughly 30% to 50%, and clean it regularly so it does not grow mould.
- Use saline for a dry nose. A saline spray or gel is simple and effective for morning dryness.
- Honey for a dry cough, for anyone over one year old.
And please see a doctor if a cough lasts more than three weeks, if you cough blood, if nosebleeds are frequent or heavy, or if a change in bowel habit persists, especially with blood or weight loss. Dryness is common. Those signs need a proper look.
Where Karviva Fits In
If dryness is a fluid and nourishment problem, it is not solved in a day. It is solved by eating in a way that keeps moisture and nutrients coming in steadily.
Our whole-plant approach matters here in a specific way. Because we blend rather than juice, the fibre stays in the bottle. Fibre is what gives stool its bulk and helps it hold water, which is exactly what dry, hard stools are missing. A juice stripped of its fibre does not do that job.
For the skin, ACE Collagen pairs collagen with vitamins A, C and E. I will not tell you a drink fixes a dry skin barrier; humidity, moisturiser and time do most of that work. What I will say is that skin is built from what you eat, continuously, and that a season of dry air is a good time to pay attention to it.
As I said in Part 1, this is not the season for ice-cold drinks. Let the bottle sit out a little and have it with a warm meal.
These are foods and beverages, not medicines. They do not treat eczema, constipation, cough or any other condition.
In Part 3, we turn to the emotion Chinese medicine assigns to autumn and the Lung: grief. What does “sorrow dissolves qi” mean, and what does modern research say about what loss does to the body?
