Yan Hu Suo (延胡索): Corydalis in TCM — The Premier Herb for Pain Relief Through Blood and Qi Movement
Discover Yan Hu Suo (Corydalis rhizome), TCM's most powerful herb for pain relief — it invigorates blood, moves Qi, and stops pain throughout the body, used for chest pain, abdominal pain, headache, menstrual cramps, and traumatic injury.
What Is Yan Hu Suo?
Yan Hu Suo (延胡索), the rhizome of Corydalis yanhusuo, is arguably the most important pain-relieving herb in the entire TCM pharmacopeia. Li Shizhen, the great Ming Dynasty herbalist, praised it in the Bencao Gangmu: “Among herbs that stop pain, Yan Hu Suo is the best of all.”
The herb works by invigorating blood and moving Qi — addressing the fundamental TCM principle that “where there is no flow, there is pain; where there is flow, there is no pain” (不通则痛，通则不痛). Its ability to simultaneously move both Qi and blood makes it effective for pain in virtually any part of the body.
Basic Information
| Property | Details |
|---|---|
| Chinese name | 延胡索 (Yán Hú Suǒ) |
| English name | Corydalis Rhizome |
| Pharmaceutical name | Corydalis Rhizoma |
| Source | Tuber of Corydalis yanhusuo |
| Nature | Warm |
| Flavor | Acrid, bitter |
| Meridian affinity | Heart, Liver, Stomach |
| Dosage | 3–10g (decoction); 1.5–3g (powder) |
TCM Properties and Actions
Primary Actions
- Invigorates blood and dispels stasis (活血散瘀) — removes blood stagnation
- Moves Qi and relieves pain (行气止痛) — the core action
- Particularly effective for pain in the chest, abdomen, and extremities
Why It’s the “King of Pain Relief”
Yan Hu Suo is unique because it:
- Moves both Qi and blood — most herbs move one or the other
- Works on pain in all body regions — chest, abdomen, head, limbs, back
- Has rapid onset — especially when taken as powder
- Is versatile — can be combined with different herbs for different pain types
Clinical Applications
1. Chest Pain and Heart Conditions (胸痹心痛)
- Angina-type chest pain, tightness, stabbing pain
- Blood stasis in the Heart meridian
- Combined with Dan Shen, Tan Xiang, Gua Lou
- Modern use: supportive for angina pectoris
2. Stomach and Abdominal Pain (胃腹痛)
- Stomach ache from Qi stagnation or blood stasis
- Colicky abdominal pain
- Ulcer-type pain (stabbing, fixed location)
- Combined with Chuan Lian Zi, Bai Shao, Gan Cao
3. Menstrual Pain (痛经)
- Painful periods with dark clots
- Cramping before or during menstruation
- Blood stasis pattern
- Combined with Dang Gui, Chuan Xiong, Xiang Fu, Bai Shao
4. Headache (头痛)
- Stabbing or throbbing headache
- Pain fixed in one location
- Blood stasis-type headache
- Combined with Chuan Xiong, Bai Zhi, Man Jing Zi
5. Traumatic Pain (跌打损伤)
- Pain from injuries, falls, sprains
- Swelling and bruising
- Combined with Ru Xiang, Mo Yao, San Qi
- Can be used both internally and externally
6. Hernia and Testicular Pain (疝气痛)
- Pain in the groin or testicles
- Cold-type or Qi stagnation-type
- Combined with Xiao Hui Xiang, Wu Yao, Ju He
Classic Pairings
| Pairing | Purpose |
|---|---|
| Yan Hu Suo + Chuan Lian Zi | Stomach and abdominal pain — the classic “Jin Ling Zi San” |
| Yan Hu Suo + Dan Shen | Chest pain, heart conditions |
| Yan Hu Suo + Chuan Xiong | Headache, generalized pain |
| Yan Hu Suo + Dang Gui | Menstrual pain, blood stasis |
| Yan Hu Suo + Xiang Fu | Qi and blood stagnation pain |
Key Formulas
Jin Ling Zi San (金铃子散)
The most famous Yan Hu Suo formula:
- Yan Hu Suo: 10g
- Chuan Lian Zi: 10g
- Grind to powder, take 3-6g with warm water
- Use: Chest, abdominal, and rib pain from Qi-fire stagnation
Yan Hu Suo San (延胡索散)
- Yan Hu Suo combined with blood-moving herbs
- Use: Menstrual pain with blood stasis
Preparation Methods
| Form | Enhanced Action |
|---|---|
| Raw | Stronger blood-moving, acute pain |
| Vinear-processed (醋炙) | Enhanced pain relief, guided to Liver meridian |
| Wine-processed (酒炙) | Enhanced blood invigorating action |
| Powder | Most effective for rapid pain relief (1.5-3g dose) |
Modern Research
- Tetrahydropalmatine (THP): Primary active compound — potent analgesic
- Dopamine receptor antagonist: Mechanism of pain relief
- Clinical trials: Effective for various pain types including dysmenorrhea, headache, and gastralgia
- Anti-arrhythmic: Some evidence for heart rhythm support
- Sedative: Mild calming effects
- Non-opioid: Pain relief without typical opioid side effects
Comparison with Similar Herbs
| Herb | Moves Qi | Moves Blood | Best Pain Type |
|---|---|---|---|
| Yan Hu Suo | ✓✓ | ✓✓ | All pain types — the universal pain herb |
| Chuan Xiong | ✓✓ | ✓ | Headache, wind pain |
| Ru Xiang | ✓ | ✓✓ | Injury pain, swelling |
| Dan Shen | ✓ | ✓✓ | Chest pain, Heart conditions |
| Xiang Fu | ✓✓ | — | Qi stagnation pain (no blood focus) |
Precautions
| Situation | Guidance |
|---|---|
| Pregnancy | Contraindicated — blood-moving properties |
| Active bleeding | May increase bleeding risk |
| Menstrual heaviness | May increase flow |
| Hypotension | May lower blood pressure |
| Pre-operative | Discontinue 2 weeks before surgery |
Key Takeaways
- Yan Hu Suo is TCM’s premier pain-relieving herb — “king of pain relief”
- Uniquely moves both Qi and blood, making it effective for all pain types
- Best taken as powder for rapid effect; vinegar-processing enhances analgesic action
- Key active compound THP has strong scientific evidence for pain relief
- Contraindicated in pregnancy and active bleeding conditions
Disclaimer: This article is for educational purposes only. Consult a licensed TCM practitioner before using Yan Hu Suo or any herbal preparation.
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FAQ
What is Yan Hu Suo used for?
Yan Hu Suo (Corydalis rhizome) is TCM's premier herb for pain relief. It is used for virtually all types of pain caused by Qi stagnation and blood stasis — including chest pain (angina), stomach pain, abdominal pain, headache, menstrual cramps (dysmenorrhea), and pain from injuries. In the classic Bencao Gangmu, Li Shizhen stated that Yan Hu Suo can treat pain in all parts of the body. Its active compound, tetrahydropalmatine (THP), has been scientifically confirmed to have significant analgesic effects. It is one of the most clinically validated pain-relieving herbs in the TCM pharmacopeia.
Is Corydalis effective for pain relief?
Yes — Corydalis (Yan Hu Suo) has significant scientific evidence supporting its analgesic effects. Its primary active compound, tetrahydropalmatine (THP), acts on dopamine receptors and has been shown to provide pain relief comparable to some conventional analgesics in clinical studies. It is used for various pain types: menstrual cramps, headache, chest pain, stomach pain, and nerve pain. Unlike opioid painkillers, it does not typically cause respiratory depression, though it should still be used under professional guidance. It works best for pain related to Qi stagnation and blood stasis in TCM terms.
Disclaimer
This content is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before using any herbal preparation.