Dampness, Mucus and Phlegm: The Pathogen That Sticks

Every pathogen in Chinese medicine has its temperament. Wind is a burglar: quick, opportunistic, gone as soon as it’s in. Dampness is a tenant. It settles, it digs in, and the texts name it without hedging as the most stubborn of the six excesses.

Fourth instalment of our series on pathogenic factors (the architecture of defence, Wind, allergies): here’s the one that won’t be chased out in a week.

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A diagnosis in five adjectives

Dampness is taught through its adjectives: heavy, turbid, sticky, lingering, low. Looking for those five qualities in a person’s account gives you the diagnosis more reliably than any single sign.

Heavy: the head as though bandaged, limbs of lead, dull aching that points nowhere in particular. Turbid: whatever it produces is never clear, thickened secretions, murky urine, and that greasy coating on the tongue which remains the pivotal sign of the whole picture. Sticky: stools that cling, a pasty mouth on waking, the sense of never quite finishing. Lingering: a course that drags on, recurs, and shrugs off quick treatments. Low, finally, as a tendency: swollen legs, pelvic heaviness, complaints of the lower limbs. Even so, a heavy head tells its own version of Dampness, the kind that keeps clear yang from rising.

Add one behavioural trait: Dampness obstructs. It blocks the mechanics of Qi, and digestion feels it first, with bloating, nausea, appetite gone flat, and no thirst despite a dry mouth. That last paradox throws patients off. It’s typical. The body is waterlogged with fluid it isn’t distributing, so it doesn’t ask for more.

The Spleen, source of the problem

Where does it come from? From outside, sometimes: damp climates, basements, wet clothes, sticky summers. But the version that fills the clinic is internal, and it has an address. The Spleen.

In Chinese physiology the Spleen transforms and transports. It converts food and drink into Qi, Blood and useful fluids, then distributes the lot. The texts specify that it likes dryness and dreads damp. When it weakens, through irregular eating, too much raw and cold food, mental overwork or long illness, fluids stop being transformed and pile up as dead water. Then the circle closes, because that standing water in turn hampers the Spleen that produced it. External Dampness and internal Dampness invite each other in.

Out of that circle comes a constant strategy, almost a reflex of the trade: treating Dampness always means supporting the Spleen. Drying without addressing the source is mopping under an open tap.

From mucus to phlegm: water that thickens

Let Dampness stagnate long enough, heat it with a stagnation or a fire of some kind, and it condenses. The tradition calls that condensate Tan (痰), phlegm.

There are two sorts, and the distinction is one of the more singular ideas in this medicine. Substantial phlegm can be seen: expectoration, a congested throat, mucus. “The Spleen is the source of phlegm, the Lung its reservoir,” says the adage, and a chronic wet cough is often manufactured a storey below where you hear it. Insubstantial phlegm can’t be seen. These are condensed fluids lodged outside the airways, which the tradition invokes to read dizziness with a heavy head, nausea, certain nodules, and even pictures where the mind seems fogged. You can stay sceptical about that extension of the concept. You have to at least grant it its internal consistency: everywhere, the same signature, a greasy coating, a slippery pulse, a sense of congestion.

A word on the Heat-Dampness pair, the most productive one in clinic. When the two combine, you get pictures that linger and run hot at once: moderate fevers that drag on, dark and turbid urine, a yellow greasy coating. This is Dampness at its most obstinate, the kind that sticks to the digestive system for weeks.

What the plate has to do with it

If the Spleen is the source, the plate is upstream of the source. Chinese dietetics draws a few simple orientations from that reasoning: cut back on what chills and overloads transformation (too much raw, iced, dairy, sugar), favour cooked, warm and simple food. Not as prohibitions, since Chinese medicine knows no forbidden food, only terrains, but as a slope to follow.

Two articles follow that slope. The next one takes a detour through history: how Chinese physicians of the Ming theorized epidemics without a microscope, and why their therapeutics ended up poured into soups. The one after that goes all the way down to the pot, with the recipe for congee, the rice porridge the tradition has served to tired digestions for two thousand years.

People come to see us for acupuncture in Montreal with pictures where this lingering heaviness dominates: sluggish digestion, fatigue after meals, congestion that keeps coming back. The assessment then works out how much belongs to the Spleen, to the Lung and to the terrain. Booking is done online through Jane.