Yang deficiency

Yang (阳) is warmth and movement — the pilot light rather than the fuel. Where qi deficiency is a body running below capacity, yang deficiency is the same emptiness that has gone on long enough to lose its heat. Every yang pattern is a qi pattern with cold added; the reverse is not true.

The Suwen states the mechanism in five characters: 阳虚则外寒, when yang is vacuous there is cold on the outside. What follows from it is the whole clinical picture. Warmth is generated centrally and delivered outward, so the extremities go first, the belly and lower back next, and the person compensates by adding layers that never quite work.

The kidney (肾) carries the root of it. Later writers called that root 命门 mìng mén, the gate of life — a term first argued over in the 难经 Nanjing, the Classic of Difficult Issues, around the first century CE, and still the standard name for the body’s source of warmth. The spleen (脾) carries the digestive half: enough warmth to cook a meal internally, which is why cold food lands so badly.

One clause, two patterns, and the pair of them still organise the way a report is written twenty-two centuries later.

People with this pattern do not describe themselves as ill. They describe themselves as the person in the office who wears a coat indoors.

• Hands and feet that stay cold in a warm room, and take a long time to warm in bed.
• A lower back that aches and feels cold to the person, though not always to the touch.
• Loose stools before dawn, between five and seven — the classics name it 五更泻 wǔ gēng xiè, fifth-watch diarrhoea.
• Passing pale urine often, and getting up in the night to do it.
• Wanting hot drinks all day, and feeling markedly worse in winter, in rain, and in air conditioning.
• Puffiness around the eyes or ankles in the morning; low drive and a slow start.
• Period cramping that is cold and dragging, and that eases with a hot water bottle rather than with movement.

The hot water bottle detail is worth pausing on. In Chinese medicine, what makes something better is as much a part of the description as the thing itself. Pain that eases with warmth and pressure is read as empty and cold; pain that hates both is read as full and stuck.

This tongue looks like a qi deficiency tongue with the contrast turned down and the water turned up.

Wetness is the separator. A pale swollen tongue that is merely moist reads as qi; the same tongue visibly wet reads as yang, and reads as dampness once the coating thickens and turns greasy.

Warmth is the whole subject here, and most of what helps is physical rather than dietary — which makes it the cheapest pattern on this site to do something about.

What tends to make it heavier

• Iced drinks, salads and smoothies as the default, especially at breakfast.
• Sitting on cold surfaces, going out with wet hair, and bare ankles between October and April.
• Under-dressing the lower back and belly, the two areas the tradition asks you to keep covered.
• Long exhaustion, night shifts, and years of pushing through.
• Cold damp housing, and the wet end of a northern winter.

What tends to ease it

• Applied warmth on the lower back and lower belly: a hot water bottle for twenty minutes in the evening does more here than any food on the list.
• A cooked breakfast, and hot rather than cold water through the day.
• Fresh ginger simmered with jujube, drunk in the morning rather than at night.
• Morning daylight and movement early in the day; socks, and a scarf over the lower back on a cold train.
• Warm feet at bedtime, by whatever means works.

Warming food in this tradition means food whose effect is warming, cooked in a warming way. Long, slow and wet beats quick and dry.

• 生姜 shēng jiāng, fresh ginger — a few slices simmered with 大枣 jujube is the standard household drink for this pattern.
• 肉桂 ròu guì, cinnamon bark, and 桂圆 guì yuán, longan, in small amounts in stews.
• Lamb, beef and chicken, cooked long; walnut, chestnut, chive and leek.
• 小茴香 xiǎo huí xiāng, fennel seed, and a little black pepper in cooking.
• Congee, soups and stews rather than salads and raw fruit.
• Less: iced water, raw fruit at breakfast, and dairy straight from the refrigerator.

Everything above is on the food as medicine page with its traditional associations written out. As always these are ordinary portions of ordinary food, not measured amounts of anything.

The paired point is 足三里 Zúsānlǐ, Stomach 36, the same point named for qi deficiency, because the warmth in question is generated by the digestion. Classically this point is warmed rather than merely pressed — moxibustion, 艾灸 ài jiǔ, a smouldering herb held near the skin. That is a practice best learned in person from someone who can watch you do it, and it is not something we suggest by email.

What travels safely in writing is pressure: thumb or knuckle, firm, thirty to sixty seconds, both legs, ideally in the morning. How to find Zusanli, and the general rules, including the ones about not pressing over a leg that is swollen or painful.

This is the most overlapping pattern of the five, because cold slows everything else down.

• It is qi deficiency with cold added, and almost never appears without that background.
• Cold and dampness together are so common the tradition has one name for the pair, 寒湿 hán shī, cold damp — heavy, puffy, loose and cold at once.
• Long-standing yang deficiency can eventually draw down yin as well, which is why some readings name both and why the suggestions then get careful.
• It differs from blood deficiency in what the cold feels like: cold from emptiness of warmth, rather than cold from not enough to circulate.

When a reading names cold damp, the food page and the movement suggestions matter more than usual, and the timescale is honestly given in seasons.

Warmth is a reasonable thing to add to your life whatever a clinician finds. It is not a reasonable thing to substitute for finding out.