Disorders of Sweating – Comprehensive Study Notes

Conceptual Framework

• Sweat (汗, Han) in TCM
  • Exterior expression of Body Fluids + Yang Qi pushed to the surface by Wei Qi (卫气, Defensive Qi).
  • Proper sweating depends on free flow of Wei Qi, unobstructed pores, and adequate constitution of Qi, Blood, Yin & Yang.
  • Disorders are grouped clinically as:
  • Lack of sweating (anhidrosis)
  • Spontaneous / day-time sweating (often deficiency-type)
  • Night sweating (mainly Yin-deficiency; not the focus of this lecture)
  • Profuse / pathological sweating from excess patterns (heat, damp, summer-heat, etc.)

Lack of Sweating (Anhidrosis)

• Acute exterior cold blocking the pores

  • Pathogenesis: Cold pathogen contracts skin ⇒ pores shut ⇒ no sweat.
  • Accompanied by recent-onset chills, fever, body aches, stiff neck, aversion to wind.
  • Treatment principle: Release exterior, open pores, promote mild sweating. (e.g. $Ma\,Huang\,Tang$, $Gui\,Zhi\,Tang$ variants.)

• Sub-acute heat pathogen penetrating to Ying/Xue levels & exhausting fluids

  • Heat has consumed Jin-Ye, yet pores cannot open; patient may be febrile without sweat.
  • Extremely rare in modern clinic; historical use of costly animal medicinals (e.g.
    cow/monkey gall-stones, rhinoceros horn substitutes, etc.).

• Chronic internal patterns

  • Liver Qi stagnation, Liver/GB heat, or complex mixed patterns may eventually impair the opening/closing of pores.
  • Manage by treating the deeper mechanism; little need for surface-releasing formulas.

Clinical pearl: Complete absence of sweat is seldom a chief complaint. In practice the symptom is evaluated in the context of overall pattern; it can temporarily be “parked” if it does not fit the main diagnosis.

Spontaneous Sweating – Deficiency & Disharmony Patterns

1. Wei Qi / Lung Qi Deficiency

• Presentation: Easily catch colds, dislike drafts, spontaneous daytime sweat, pale tongue, weak pulse.
• Formula: Yu Ping Feng San (玉屏风散)
  • $Huang\,Qi$ 30 g — tonifies Qi & stabilises exterior
  • $Bai\,Zhu$ 9 g — strengthens SP ➞ source of Wei Qi
  • $Fang\,Feng$ 9 g — expels wind, protects surface
• Possible additions (astringents): $Wu\,Wei\,Zi$, $Suan\,Zao\,Ren$, $Long\,Gu$, $Mu\,Li$, $Shan\,Zhu\,Yu$.

2. Disharmony of Ying & Wei

• Alternating slight fever & chills, aversion to wind, sweating that comes & goes, occasional flushing or anxiety.
• Formula: Gui Zhi Tang (桂枝汤) (harmonises nutritive & defensive)
  • May be combined with Yu Ping Feng San if pronounced Wei Qi deficiency co-exists.

3. Qi & Yin Deficiency (LU/HT)

• Fatigue, palpitations, dry mouth/throat, spontaneous or night sweating, possible dry cough.
• Formula: Sheng Mai San (生脉散)
  • $Ren\,Shen$ — tonify Qi
  • $Mai\,Men\,Dong$ — nourish Yin, generate fluids
  • $Wu\,Wei\,Zi$ — astringe sweat, stop leakage
• Differentiation: warmer, drier picture vs colder, weaker picture of Yu Ping Feng pattern.

4. Kidney Yang Deficiency ➞ Wei Qi not secured

• Aching low back/knees, cold limbs (esp. below waist), edema, frequent or incontinent urination, worse on exertion.
• Formula: Jin Gui Shen Qi Wan (金匮肾气丸)
  • Classic 8-herb pill warming KD Yang.
  • Modifications:
  • Add $Sha\,Ren$ to aid digestion if Fu Zi/Rou Gui feel too heavy.
  • To tighten pores, combine with small dose $Wu\,Wei\,Zi$.

Excess-Type (Profuse) Sweating Patterns

1. Exterior Deficiency + Wind-Damp ➞ Edema & Sweating

• Pathogenesis: Weak exterior, invasion of wind-damp ➞ sweating, heaviness, superficial edema.
• Formula: Fang Ji Huang Qi Tang (防己黄芪汤)
  • $Han\,Fang\,Ji$ + $Huang\,Qi$ (chiefs)
  • $Bai\,Zhu$, $Gan\,Cao$, $Sheng\,Jiang$ / $Da\,Zao$ support SP, harmonise Ying-Wei.
  • Strengthens Qi, opens water pathways, promotes urination, stops sweat.

2. Qi-Level Yang-Ming Heat (“Four Bigs”)

• High fever, profuse sweat, great thirst, surging‐rapid pulse, possible irritability.
• Formula: Bai Hu Tang (白虎汤)
  • $Shi\,Gao$ 30–90 g – clear blazing Qi-level heat
  • $Zhi\,Mu$ 9 g – drain heat, protect Yin
  • $Geng\,Mi$ (Jing Mi) & $Zhi\,Gan\,Cao$ – protect ST & fluids
• Notes:
  • No astringents; sweating is due to excess heat, not pore laxity.
  • Clinician may add $Ren\,Shen$ ⇒ Bai Hu Jia Ren Shen Tang if Qi has been damaged.

3. Summer-Heat Injuring Qi & Yin

• Post-heat-stroke picture: lingering low-grade fever, fatigue, SOB, thirst, spontaneous sweat.
• Formula: Qing Shu Yi Qi Tang (清暑益气汤)
  • Ingredients typ. include $Xi\,Yang\,Shen$, $Shi\,Hu$, $He\,Geng$, $Zhi\,Mu$, $Huang\,Qi$, $Wu\,Wei\,Zi$, $He\,Ye$, $Dang\,Gui$, $Gan\,Cao$.
  • Actions: Clear summer-heat, boost Qi, nourish Yin, generate fluids, stop sweating.
  • Distinction from Sheng Mai San: pathogen (summer-heat) still present ➞ must clear heat and supplement.

Key Astringent / Stabilising Materia Medica

• $Wu\,Wei\,Zi$ (五味子) – sour → lung, kidney; stops sweat/diarrhoea, generates fluids.
• $Suan\,Zao\,Ren$ (酸枣仁) – nourishes HT Yin & Blood, calms shen, stops sweat from Yin def.
• $Long\,Gu$ & $Mu\,Li$ – anchor Yang, prevent leakage of fluids.
• $Shan\,Zhu\,Yu$ – tonifies LV/KD, secures Essence & sweat.
• Guideline: Do NOT add strong astringents in overt heat or damp closure – risk trapping pathogen.

Practical / Clinical Take-Aways

• Chief complaint of “I never sweat” is rare; excessive sweating (palms, whole-body, menopausal flashes) is far more common in clinic.
• Always verify whether sweating is primary pathology or a secondary manifestation; treat the pattern as a whole.
• If a single symptom does not fit the otherwise coherent pattern, it can be monitored while proceeding with treatment – reassess after several visits.
• Digestive weakness with heavy tonic formulas (e.g., $Jin\,Gui\,Shen\,Qi\,Wan$):
  • Reduce dose of sticky herbs; add aromatics (e.g., $Sha\,Ren$, $Chen\,Pi$).
• Protect Middle Jiao when prescribing cold, mineral-rich formulas (e.g., $Bai\,Hu\,Tang$): always include $Geng\,Mi$ / $Gan\,Cao$ or have patient drink rice-broth sidecar.

Exam Prep Hints (per instructor)

• Be able to match a symptom cluster to a pattern & formula.
• Memorise core ingredients, actions, and distinguishing features between look-alike formulas:
  • Yu Ping Feng San vs. Fang Ji Huang Qi Tang
  • Sheng Mai San vs. Qing Shu Yi Qi Tang
  • Bai Hu Tang vs. Gui Zhi Tang (heat excess vs. Ying-Wei disharmony)
• Single-answer questions will also ask for principal indications & dosage tweaks (e.g., when to add $Wu\,Wei\,Zi$).