Night-Sweating Patterns, Formulas & Key Herbs

Night‐Sweating: Key Patterns & Pathomechanisms

General mechanism: Sweat is governed by the Heart and pushed to the exterior by Wei Qi. Any failure to consolidate the exterior or any internal heat that forces fluids outward can produce night sweating.

1. Yin-Deficiency ± Relative Yang Excess

• Tongue: red, scant coat | Pulse: thin-rapid.

• Worse at night (yin‐time) because insufficient yin fails to anchor yang.

• Formula hierarchy

  • Mild: $Zhi! Bai\; Di\; Huang\; Wan$ or other classic KD/LV-yin tonics.

  • Marked heat & profuse sweat: Dang Gui Liu Huang Tang (see below).

2. Yin & Blood Vacuity + Superimposed Heat

• Combines true yin / blood loss with a layer of excess heat.

• Characteristic formula: Dang Gui Liu Huang Tang (Angelica with Six Yellows).

  • Nourishes blood & yin, clears blazing fire, secures the exterior.

3. Qi Stagnation → Constraint Heat (Liver Pattern)

• S/S: wiry pulse, irritability, PMS / dysmenorrhoea, flank distention, digestive upset ± night sweats / hot flashes.

• Formula: Jia Wei Xiao Yao San (= Xiao Yao San + $\mu\,\textit{dan pi}+zhi zi$).

  • Moves LV Qi, clears constraint heat, nourishes blood/yin.

• Used when tongue not markedly red and heat signs derive from stagnation rather than vacuity.

4. Heart Blood (± Spleen Qi) Deficiency

• S/S: palpitations, insomnia, poor memory, fatigue, pale tongue, thin weak pulse; night sweat without pronounced heat.

• Formula: Gui Pi Tang (Restore the Spleen Decoction)

  • Anchors Heart spirit, generates blood, tonifies SP Qi, astringes sweat.

  • Key herbs acting on sweat: $huang qi$ (consolidates exterior) + $suan zao ren$ (sour-astringent).

  • Add $long\,\;gu$ or $mu\,\;li$ for persistent leakage.

5. Dampness Obstructing Wei Qi at the Surface

• S/S: night sweat with sensation of heaviness, lethargy, chest/epigastric oppression, sticky tongue coat, slippery or soggy pulse.

• Core formulas

  • San Ren Tang (Three-Seed Decoction)

  • Upper burner seed – $xing ren$

  • Middle – $bai dou kou$

  • Lower – $yi yi ren$

  • Plus $hou po, ban xia, tong cao, dan zhu ye, hua shi$ ➔ drains damp, vents latent heat, mildly releases exterior.

  • Huo Po Xia Ling Tang & Ping Wei San – similar damp‐transforming strategies; former releases exterior, latter purely internal.

6. Lingering (Latent) Shao-Yang Pathogen

• Hx of unresolved external illness; exterior signs gone but night fever & sweat persist.

• Prototype prescription: Xiao Chai Hu Tang ➔ If sweating predominates: drop drying herbs & add $qing\,hao$ for deficient-heat, or reinforce with $chai hu$ + $huang qin$ if alternating fever/chills remain.

Core Formula Details

Dang Gui Liu Huang Tang (Angelica + 6 Yellows)

Actions & notes

• $\to$ Strongest classical night-sweat formula; clears blazing fire while powerfully enriching yin/blood.

• Modification ideas:

  • Very profuse sweat: + $long\,gu$, $mu\,li$ (astringe) or increase $huang qi$.

  • Severe deficient heat: + $zhi\,mu$, $qing\,hao$.

  • Digestive weakness: fry $shu di$ or lower its dose.

Comparison

• vs $Liu Wei Di Huang Wan$ – milder, mostly nourishing; Dang Gui Liu Huang Tang adds stronger heat-purgers and an astringent component.

• vs $Zhi Bai Di Huang Wan$ – Zhi Mu + Huang Bai only; less blood-nourishing, less sweat-securing.

Gui Pi Tang

Core ingredients
\bigl{ren\,shen, huang\,qi, bai\,zhu, fu\,shen, dang\,gui, suan zao ren, long yan rou, yuan zhi, mu\,xiang, zhi gan cao, sheng jiang, da zao\bigr}

Key points

• Treats night sweating due to failure of Heart blood to anchor spirit + weak Wei Qi.

• Two built-in sweat stabilizers: $huang qi$ (exterior) & $suan zao ren$ (sour).

• For relentless leakage add minerals ( $long gu, mu li$ ).

Jia Wei Xiao Yao San

• Base Xiao Yao San + $mu\,dan pi$ & $zhi zi$ to clear stagnation heat.

• Use when night sweating coexists with classic LV Qi stasis picture.

San Ren Tang vs Huo Po Xia Ling Tang vs Ping Wei San

Herb Focus

1. Mu Tong (Akebia Caulis)

• Nature/Flavor: bitter, cold.

• Channels: HT, SI, UB.

• Actions

  • Promotes urination, drains HT fire via SI → UB → urine.

  • Clears damp‐heat, unblocks painful urinary dribbling.

  • Unblocks channels & vessels; promotes lactation.

• Dose: $3!\text{–}6\,g$ (higher 9–15 g in modern texts). Fry‐dry to moderate coldness.

• Classical swaps: historical confusion with $tong\,cao$; modern use keeps names straight.

• In formulas: $Ba\; Zheng\; San$, $Dao Chi San$, $Wen Jing Tang$ etc.

2. Hou Po (Magnoliae Cortex)

• Nature/Flavor: bitter, acrid, warm; LU/LI/SP/ST.

• Actions

  • Moves Qi & resolves fullness, especially abdomen.

  • Dries/transform damp & phlegm.

  • Directs rebellious Qi downward, calms wheeze.

• Dose: $3!\text{–}9\,g$; contraindicated pregnancy.

• Processing: Jiang Zhi Hou Po (ginger-prepared) – mitigates harsh dryness, reinforces downward action.

• Core combinations

  • $zhi\ shi$ (Da Cheng Qi Tang) – purge accumulation.

  • $cang\ zhu$ (Ping Wei San) – dry damp in MJ.

  • $xing ren$ (San Ren Tang) – open chest, descend LU Qi.

Clinical Modification Tips & Pearls

• Night sweat of yin-deficiency may respond to simple astringents (e.g.
  $wu wei zi, wu mei$) only after yin is replenished; avoid trapping evil heat.

• When using Dang Gui Liu Huang Tang in digestive-weak patients:

  • Reduce $shu\,di$ or substitute $sheng di$.

• Long Gu / Mu Li can be added (15–30 g crush first) to any deficiency pattern that leaks sweat.

• Qing Hao (Sweet Wormwood)

  • Clears deficient bone-steaming heat, vents lurking pathogens – useful substitute or adjunct for $chai\,hu$ if upward LV-Yang aggravation or patient sensitive to chai hu.

• Processing hacks: Shan Han method of double-decocting (remove herbs halfway then reduce) softens harsh floating properties of $chai hu$.

Differential Diagnosis Strategy ("One Symptom ⇄ Many Patterns")

Night-vs-day: spontaneous daytime sweat = Wei Qi / Lung Qi deficiency; night sweat = Yin / blood deficiency or lurking heat unless otherwise proven.

Bridge to Next Topic – Urinary Disorders

Patterns reviewed at lecture end (to be detailed next class):

• Dark, scant urine → heat types.

• Cloudy / turbid → damp (± heat).

• Clear, profuse → KD Yang / Qi deficiency.

• Difficult / obstructed → heat, damp, cold, or Qi stagnation.

• Incontinence / enuresis → KD Qi or Yang vacuity.

• Painful or bloody urination → mostly heat, sometimes stasis.

Corresponding formula families span $Ba\;Zheng\;San, Zhu\;Ling\;Tang, Wu\;Ling\;San, Jin\;Gui Shen Qi Wan$, etc. Details forthcoming.

Exam clues (per instructor)

• Questions will supply enough signs to fix a single pattern – beware of over-thinking.

• Focus on differentiating

  • Yin-deficiency vs Heart‐Blood deficiency vs Damp type.

  • Milder vs stronger heat clearing capacity of formulas.

Good luck in your preparations!