When a patient says “I have rheumatism”, Western medicine opens an immense classification: osteoarthritis, arthritis, tendinitis, gout, fibromyalgia. Chinese medicine does the opposite: it gathers almost all these pains under a single word, Bi Zheng (痹证), the “painful obstruction syndrome”. This two-thousand-year-old concept remains the reading grid of all Chinese rheumatology, and it has one decisive advantage: it explains why the pain moves, why it settles, why it burns, and what the plate can change about it.
Bi Zheng: when the channel blocks
The character 痹, Bi, means obstruction, blockage, numbness. In the body, the channels are circulation routes: Qi and Blood pass through them to nourish muscles, tendons and bones. Bi Zheng is the moment when one of these routes becomes blocked: a pathogenic agent settles in, circulation stops, and where nothing circulates any more, there is pain.
The Nei Jing states the mechanics in a single sentence: “When Wind, Cold and Dampness combine and attack together, they produce Bi.” Three intruders, one blocked channel, one pain. Heat is added later, when the obstruction becomes inflamed or the terrain heats up.
The first lesson of the concept is already a diagnosis: the pain is not the disease, it is the signal of the obstruction. And the obstruction always has a nature: what we identify is not “where it hurts” but “what is blocking the channel”.
Wind, Cold, Dampness, Heat: the four profiles
TCM clinical practice distinguishes four types of Bi, each bearing the signature of its pathogen.
| Type | Pathogen | Pain signature | Accompanying signs |
|---|---|---|---|
| Xing Bi (行痹), Wandering Bi | Wind | Migrating, changing, moving from one joint to another | Aversion to wind, sudden onset, thin coating |
| Tong Bi (痛痹), Painful Bi | Cold | Fixed, intense, relieved by heat, aggravated by cold | Morning stiffness, joint cold to the touch |
| Zhuo Bi (着痹), Fixed Bi | Dampness | Heavy, numb, fixed, swelling | Aggravation in damp weather, heaviness of the body |
| Re Bi (热痹), Heat Bi | Heat | Burning, joint red, hot and swollen | Pain unbearable to the touch, thirst, local fever |
The table is deliberately simple: in practice, pathogens rarely travel alone. Combined Wind-Cold-Dampness is the classic picture of the “rheumatism” that worsens in winter and under rain. But one of the three always dominates, and it is that one which sets the tone of the treatment.
The pain that moves vs the pain that stays
Two clinical questions carry almost the whole diagnosis:
Does the pain travel? A pain that was in the knee yesterday and in the shoulder today bears the mark of Wind: mobile, unpredictable, “which has no residence”. A pain faithful to the same joint for months belongs to Cold (fixed and intense) or to Dampness (fixed and heavy).
What relieves it? The hot water bottle that does good signs Cold. Complete rest without improvement, with morning stiffness that eases off as you move, leans towards Dampness. The pain that no touch can bear, red and hot, belongs to Heat.
Add the weather factor (aggravation in dampness = Zhuo Bi, in cold = Tong Bi, in rapid changes = Xing Bi) and the joint’s appearance (soft swelling = Dampness, red-hot = Heat, cold-pale = Cold): the profile takes shape.
Gu Bi: when the obstruction reaches the bone
A Bi that lasts does not stay on the surface. The classics describe the progression: the pathogen enters the channels, then reaches the tendons, then the bones. Gu Bi, bone obstruction, is the stage where the pain settles into depth: deformed joints, limited movement, a background pain that no longer responds to the weather.
At this stage, the picture changes in nature: it is no longer only an obstacle to expel, it is an exhausted terrain. The Kidneys, which govern the bones, are involved; treatment no longer merely chases the pathogen, it nourishes the root. This is the TCM reading of long-standing degenerative rheumatism, and it is why established osteoporosis or settled osteoarthritis calls for a two-stage strategy: open the obstruction, and refill the terrain.
The diet that opens the channel: a strategy per type
The dietetics of Bi follows the logic of the pathogen: you do not nourish a Wind the way you warm a Cold.
Against Wind (migrating pain): nothing that stirs, everything that stabilises. Avoid too much raw food and excesses of dispersing flavours; favour foods that nourish the Blood, because the clinical rule says “to treat Wind, first treat the Blood”: lentils, beetroot, lean meat, seeds.
Against Cold (fixed pain relieved by heat): everything lies in warmth. Hot cooked meals, fresh ginger, cinnamon in small doses, long-simmered soups. Cut out dietary cold: iced drinks, excess raw food, yoghurts straight from the fridge. The cold you swallow joins the cold in the channel.
Against Dampness (heavy, swollen, weather-sensitive pain): dry out without aggressing. Reduce mucus producers (abundant cold dairy, sweets, fried food), favour the flavours that drain: barley, beans, a little mild pungency, cooked vegetables. The morning congee, warm and simple, is here a drying strategy as much as a meal.
Against Heat (red, hot, burning pain): cool and clarify. Remove alcohol, strong chilli, grilled food, excess meat; favour green vegetables, courgette, in-season cucumber, cool infusions. The gout attack is Re Bi par excellence: the purine restriction matches the dietetics of Damp-Heat almost word for word.
One rule runs through the four types: a chronic Bi always has a deficiency component. The pathogen only settles durably where Wei Qi has left a breach; tonifying the terrain is part of the cure.
What requires medical advice
The Bi framework orders the reading, it does not replace the examination. A joint that is red, hot and feverish, a pain with weight loss or fever, morning stiffness lasting more than an hour that is setting in, a rapid deformity or a child who limps: all of this belongs to the doctor. The dietetics of Bi changes the terrain and the frequency of flare-ups; it treats neither joint infection nor inflammatory polyarthritis, which require complete care.
To go further: the four pathogens of Bi, Wind, Cold, Dampness and Heat, and the mechanics of the Wei Qi that protects the surface.
To go further
Yin Shi ecosystem resources directly related to this article.
Which terrain feeds your pain?
The Eight Principles test distinguishes the cold, heat and deficiency behind the pain.
Take the test →The four types of painful obstruction
The lesson details Xing, Tong, Zhuo and Re Bi — the forms of Bi Zheng.
Take the lesson →