Some people catch a cold with every gust of wind — year-round runny nose, recurring fevers, sweating without exertion, and a persistent aversion to draughts. Children suffer repeated tonsillitis; the elderly battle chronic respiratory infections; others are plagued by allergic rhinitis or chronic urticaria that flares with any cold air or dust. In TCM, this all traces back to one root cause: Lung Wei Qi Deficiency (肺卫气虚) with loose defensive surface (腠理不固) — the body's protective Yang Qi is depleted, the pores cannot regulate properly, and external Wind easily penetrates while fluids leak as spontaneous sweat. Yu Ping Feng San (Jade Windscreen Powder), a three-herb formula with nearly 800 years of clinical history, addresses exactly this — tonifying Qi, consolidating the surface, and expelling Wind simultaneously.
Yu Ping Feng San - TCM Formula for Qi Deficiency, Spontaneous Sweating and Recurrent Colds | HJMEDICAL">
I. Yu Ping Feng San Origins: The Jade Windscreen Formula
Yu Ping Feng San is attributed to the Southern Song dynasty text Jiu Yuan Fang (c. 1213), though that text is now lost; its most prominent surviving record appears in Zhu Danxi's Dan Xi Xin Fa (Yuan dynasty), which is the earliest extant source to use the formula name. It has since been continuously cited and applied across centuries, evolving into modern patent forms including granules, oral liquids, and tablets.
The name is carefully chosen. Yu (jade) suggests the formula's preciousness and gentle nature. Ping Feng (windscreen) is the ancient room divider that blocks draughts — a vivid metaphor for the formula's action: just as a windscreen guards the interior from wind, this formula guards the body's surface from external pathogens. A secondary interpretation links Ping Feng to Fang Feng (Saposhnikovia root, literally "Wind-guard"), one of the three herbs, whose role is precisely to expel Wind while the other two consolidate the surface.
Core pathomechanism: The Lungs govern the body's Qi and connect to the skin and body hair. Wei Qi (defensive Yang) circulates at the surface, warming the skin, regulating the pores, and repelling external pathogens. When overwork, prolonged illness, ageing, or Spleen-Stomach weakness depletes Wei Qi, the pores lose their regulatory capacity — fluids leak as spontaneous sweat, Wind easily penetrates to cause repeated colds, and Wind obstructing the channels can produce urticaria and skin itch. The formula's goal is to replenish Wei Qi and restore the surface barrier so the body achieves the classical ideal: "With righteous Qi within, pathogenic Qi cannot intrude."
II. Formula Composition
Three herbs in a precise 2:2:1 ratio — arguably TCM's most elegant minimalist formula:
| Herb | Classical dose | Modern dose | Role & Function |
|---|---|---|---|
| Huang Qi 黄芪 (Astragalus, honey-fried) | 60g | 15–30g | Chief — tonifies Lung and Spleen Qi, consolidates the surface, stops spontaneous sweat |
| Bai Zhu 白术 (Atractylodes) | 60g | 15–20g | Deputy — strengthens Spleen to generate Qi and Blood; supports Huang Qi in consolidating Wei Qi |
| Fang Feng 防风 (Saposhnikovia) | 30g | 10–15g | Assistant — expels Wind from the surface; prevents over-consolidation from trapping existing pathogens |
The classical formula song captures the synergy precisely: "Yu Ping Feng San uses Fang Feng; Huang Qi counterbalances it to achieve combined effect; Bai Zhu tonifies Qi and strengthens the defensive surface; for Wei-deficient spontaneous sweat, this formula responds."
Formula logic: Huang Qi consolidates the surface and replenishes Wei Qi — addressing the root. Bai Zhu strengthens Spleen-Earth to continuously generate the Qi and Blood that fuel Wei Qi — "cultivating Earth to produce Metal (Lung)." Fang Feng expels any Wind that has already penetrated while preventing the formula from becoming so consolidating that latent pathogens are sealed inside. The interaction between Huang Qi and Fang Feng is particularly elegant: Huang Qi prevents Fang Feng from dispersing too aggressively; Fang Feng prevents Huang Qi from trapping pathogens. Together they "consolidate without retaining evil; expel Wind without injuring righteous Qi."
Yu Ping Feng San herb composition and formula analysis | HJMEDICAL">
III. Who This Formula Suits
Core functions: Tonify Qi and consolidate the surface; expel Wind and resist pathogens; stop spontaneous sweating.
Self-assessment — check 3 or more:
- Constitution: Qi-deficient — chronic fatigue worsened by activity, pale complexion, pale tongue with thin white coating, floating deficient pulse
- Sweat and wind sensitivity: spontaneous daytime sweating (even at rest, worsened by minimal exertion), pronounced aversion to draughts, easy cold exposure after sweating
- Recurrent infections: more than 6 colds per year, or colds that linger and relapse repeatedly
- Digestive: poor appetite, loose stools, mild bloating — signs of Spleen Qi deficiency underlying the Wei Qi weakness
- Other: allergic rhinitis that flares with cold air or dust; urticaria or skin itch worsened by wind; children with recurring tonsillitis; post-surgical or postpartum debility
Modern clinical applications:
- Respiratory: recurrent upper respiratory infections in children and adults, chronic bronchitis, asthma (remission phase), allergic rhinitis — for Wei Qi deficient patterns
- Dermatology: chronic urticaria, allergic dermatitis, eczema — for Wind-invasion patterns with underlying Qi deficiency
- Nephrology: chronic glomerulonephritis with proteinuria — Lung-Spleen-Kidney Qi deficiency; may help reduce relapse triggered by colds
- Sub-health: chronic fatigue, stress-related immune depression, post-illness or postpartum recovery with spontaneous sweating and easy cold susceptibility
IV. Contraindications & Safety Notes
Do not use if you have:
- Damp-Heat accumulation — bitter sticky mouth, yellow greasy tongue coating, heavy limbs with low-grade fever; the formula's warming nature will aggravate Damp-Heat
- Excess-Heat spontaneous sweating — profuse sweating with fever and agitation; this formula treats deficiency-sweating, not excess-Heat sweating
- Yin deficiency with Fire — burning palms, night sweats, scanty red tongue coating; Huang Qi's warming nature is unsuitable
- Active cold or flu — suspend during illness; resume after full recovery
- Allergy to any ingredient
Usage notes: This formula works slowly — expect 2–4 weeks before significant improvement in immunity and sweating. Do not expect overnight results. Avoid cold, raw, oily, and spicy foods; avoid late nights and exhaustion; avoid cold exposure especially after sweating. In patent form (Yu Ping Feng Keli, oral liquid), standard adult dose is 1 sachet (5g) three times daily after meals. Children and elderly use reduced doses. Combine with a diet including yam, lotus seed, and millet to support Spleen function.
V. Dosage & Clinical Modifications
As decoction: Huang Qi 15–30g, Bai Zhu 15–20g, Fang Feng 10–15g. Add all to 600ml water, soak 30 min, bring to boil then simmer 20–30 min to ~300ml. Strain and take warm in two doses, 30 min after meals. Honey-fried Huang Qi (Mi Zhi Huang Qi) is preferred for superior surface-consolidating effect. As powder (traditional): grind in 2:2:1 ratio, take 6–9g in warm water 2–3 times daily.
Common modifications (practitioner-directed only):
- Heavy spontaneous sweating: add Fu Xiao Mai, Duan Mu Li, Ma Huang Gen
- Recurrent colds with nasal symptoms: add Gui Zhi, Sheng Jiang to warm and release
- Allergic rhinitis: add Xin Yi, Cang Er Zi to open nasal orifices
- Marked fatigue and shortness of breath: add Dang Shen, Zhi Gan Cao
- Spleen deficiency with loose stools: add Shan Yao, Lian Zi, Fu Ling
- Skin itch, urticaria: add Chan Tui, Jing Jie for Wind-dispersing and itch-relieving
- Children with recurrent infections: add Tai Zi Shen, Mai Ya (gentler Qi tonic suited to children)
- Postpartum or post-surgical debility: add Dang Gui, Shu Di Huang to nourish Blood alongside Qi
VI. Yu Ping Feng San Clinical Cases
Case 1 — Child with recurrent respiratory infections: Male, 6 years. Recurring colds and tonsillitis monthly for one year, with spontaneous sweating, aversion to wind, fatigue, poor appetite, pale complexion. Multiple courses of antibiotics brought temporary relief but quick relapse. Diagnosis: Lung Wei Qi Deficiency. Treatment: Yu Ping Feng granules 2.5g three times daily after meals, with yam-millet congee for dietary support. After 1 week: sweating and wind sensitivity improved, appetite recovered. After 1 month: no colds, energy normalised, complexion improved. Consolidation for 1 further month. Follow-up at 6 months: only 1 mild cold, self-resolved; no tonsillitis recurrence.
Case 2 — Adult with allergic rhinitis and spontaneous sweating: Female, 32. Allergic rhinitis for 3 years, flaring each autumn/winter and with cold air exposure — nasal congestion, clear discharge, sneezing. Also: spontaneous sweating even at rest, aversion to wind, fatigue, dizziness. Antihistamines controlled symptoms but did not prevent relapse. Diagnosis: Lung Wei Qi Deficiency with Wind invasion. Treatment: Yu Ping Feng decoction modified — Huang Qi 20g, Bai Zhu 15g, Fang Feng 10g, Xin Yi 10g, Cang Er Zi 10g, Zhi Gan Cao 6g, 14 days. After 7 doses: sweating and wind sensitivity reduced, rhinitis frequency decreased. After 1 month: nasal symptoms resolved, sweating cured, fatigue and dizziness improved. Follow-up at 3 months: rhinitis had not recurred; no longer catching colds after cold exposure.
Yu Ping Feng San clinical applications and results | HJMEDICAL">
Conclusion
Yu Ping Feng San, also known as Jade Windscreen, is a classic formula in traditional chinese medicine consisting of just three herbs: huang qi (astragalus root), bai zhu, and fang feng.
It is widely used in herbal formulas to strengthen spleen qi and secure the body’s defensive energy, helping to prevent frequent colds and respiratory issues. Clinically, yu ping feng san is especially valued for allergic rhinitis and allergic asthma, as it gently releases the exterior while tonifying the body rather than purging it.
Many patients seek this formula from a licensed acupuncturist or TCM practitioner when they experience recurrent allergies or weakened immunity. Its simple yet effective combination makes it one of the most commonly prescribed formulas for long-term prevention and support.
Yu Ping Feng San exemplifies TCM's principle of treating the root: rather than simply suppressing cold symptoms, it rebuilds the body's own defensive capacity. Its three-herb elegance — consolidating, generating, and expelling in perfect balance — has sustained its clinical relevance for nearly 800 years. It is particularly valuable for today's population of immune-compromised individuals, allergy sufferers, and those chronically depleted by overwork and poor sleep. Accurate pattern identification is essential — this formula is only effective for Wei Qi deficiency patterns, and will be ineffective or harmful in Damp-Heat, excess-Heat, or Yin-deficient presentations. Always confirm your pattern with a licensed TCM practitioner before use.
