Who is this article for?

This article is for readers who want a practical, beginner-friendly understanding of this TCM topic.

Can this article replace professional medical advice?

No. This content is educational only and should not replace diagnosis or treatment from a qualified healthcare professional.

Wu Zhu Yu (吴茱萸): TCM Herb for Cold Pain, Headaches, and Vomiting

What is Wu Zhu Yu?

Wu Zhu Yu (吴茱萸), known as Evodia fruit, is the nearly ripe fruit of Tetradium ruticarpum (formerly Evodia rutaecarpa). It is one of the most intensely warming herbs in the TCM pharmacopoeia, classified among herbs that “warm the interior and expel cold.”

The Chinese name has an interesting origin story: according to legend, the herb was named after Wu (a region), Zhu (meaning vermillion, for the fruit’s color), and Yu (a type of bean it resembles). It has been used since at least the Han Dynasty and appears in the Shanghan Lun and Jin Gui Yao Lue.

In raw form, Wu Zhu Yu has an extremely strong, pungent aroma and a bitter, numbing taste. After processing (usually with Gan Cao water), its harshness is tempered while its therapeutic warmth is preserved.

Properties and Channel Entry

Property	Description
Taste	Pungent, bitter
Temperature	Hot
Channels Entered	Liver, Stomach, Spleen, Kidney

The pungent flavor disperses and moves, while the bitter flavor drains downward. Its hot nature makes it one of the strongest warming herbs available — effective for deep cold conditions but requiring careful dosing.

Key Functions

1. Disperses Cold and Stops Pain (散寒止痛)

Wu Zhu Yu’s most important function. It powerfully warms the interior and dispels cold that has penetrated deep into the channels and organs:

Headache at the vertex (顶头痛): The classic indication — severe headache at the top of the head, often with vomiting of clear fluid, caused by cold ascending along the Liver channel (Jueyin)
Abdominal pain: Cold-type cramping pain, better with warmth and pressure
Menstrual pain: Cold-type dysmenorrhea with dark clots and relief from warmth

2. Warms the Middle and Stops Vomiting (温中止呕)

Wu Zhu Yu strongly warms the Stomach and directs rebellious Qi downward:

Vomiting of clear fluid or food
Nausea from cold in the Stomach
Acid regurgitation from cold deficiency
Morning sickness with cold signs

3. Warms the Spleen and Stops Diarrhea (温脾止泻)

By warming the Spleen and dispelling cold, Wu Zhu Yu treats:

Diarrhea with undigested food
Morning diarrhea (diarrhea before dawn, 五更泄)
Cold-type abdominal pain with loose stools

Clinical Applications

Jueyin Headache (Vertex Headache)

The most famous application. In TCM theory, the Liver channel (Jueyin) ascends to the vertex of the head. When cold attacks this channel, it causes:

Severe headache at the very top of the skull
Nausea and vomiting of clear fluid
Cold extremities
Dry heaves

Key formula — Wu Zhu Yu Tang (吴茱萸汤):

Ingredient	Role
Wu Zhu Yu	Warms Liver, dispels cold, stops pain
Sheng Jiang (Fresh Ginger)	Warms Stomach, stops vomiting
Ren Shen (Ginseng)	Tonifies Qi, supports upright Qi
Da Zao (Jujube)	Harmonizes, protects Spleen

This formula from the Shanghan Lun is the primary treatment for Jueyin cold headache with vomiting.

Cold-Type Vomiting and Nausea

With Sheng Jiang and Ban Xia: For vomiting of clear fluid from Stomach cold
With Huang Lian: The classic pairing in Zuo Jin Wan (左金丸) — Wu Zhu Yu’s warmth balances Huang Lian’s cold to treat vomiting and acid regurgitation from Liver fire invading the Stomach

Menstrual Pain (Cold Type)

Severe cramping relieved by warmth
Dark menstrual blood with clots
Cold lower abdomen
Often combined with Dang Gui, Chuan Xiong, and Rou Gui

Morning Diarrhea

Wu Zhu Yu warms the Spleen and Kidney Yang to treat the pattern where diarrhea occurs reliably before dawn:

With Bu Gu Zhi (Psoralea) and Rou Dou Kou (Nutmeg): For Spleen-Kidney Yang deficiency
With Si Shen Wan ingredients: Combined approach for chronic cold diarrhea

Hernia and Testicular Pain

The Liver channel passes through the genital region. Wu Zhu Yu’s entry into the Liver channel and its warming action make it effective for:

Cold-type testicular pain and swelling
Inguinal hernia pain worsened by cold
Often combined with Xiao Hui Xiang (Fennel) and Ju He (Tangerine Seed)

Processing (Pao Zhi)

Wu Zhu Yu requires processing before use to reduce its harshness and toxicity:

Method	Effect	Use
Gan Cao-processed (甘草制)	Reduces toxicity, moderates harshness	Standard clinical use
Salt-processed (盐制)	Guides to Kidney channel	For diarrhea, lower body cold
Yellow wine-processed (酒制)	Enhances dispersing action	For cold pain in channels
Raw (生用)	Strongest effect, highest risk	Rarely used; external applications

The Gan Cao-processed form is by far the most common in clinical practice.

Dosage and Preparation

Form	Dosage	Notes
Decoction (processed)	1.5–5g	Small doses — very potent
Pills and powders	0.5–1.5g	Even smaller doses
External (poultice)	As needed	Ground and applied to navel or painful area

Important Notes

Start with a low dose — Wu Zhu Yu is intensely hot and can cause stomach irritation at higher doses
Never use raw unprocessed herb internally — always use processed form
Short decoction time — add near the end of cooking (last 10 minutes) to preserve volatile components
Not for long-term use — typically used for 1–3 weeks, then reassessed

Precautions and Contraindications

Yin deficiency with heat: Night sweats, dry mouth, red tongue — this herb will worsen heat signs
Liver fire rising: Red face, red eyes, irritability, bitter taste — Wu Zhu Yu’s hot nature is inappropriate (except in the balanced Zuo Jin Wan formula)
Pregnancy: Contraindicated — its hot, moving nature may threaten pregnancy
Large doses: Can cause vomiting, abdominal pain, and visual disturbances — strictly control dosage

Modern Research

Contemporary studies on Tetradium ruticarpum have identified:

Rutaecarpine and evodiamine: The primary active alkaloids with anti-inflammatory, analgesic, and cardiovascular effects
Gastroprotection: Reduces gastric acid secretion and protects the gastric mucosa — supporting its traditional use for vomiting and acid regurgitation
Cardiovascular effects: Rutaecarpine dilates blood vessels and can lower blood pressure through CGRP release
Analgesic properties: Confirmed pain-relieving effects in animal models, especially for headache and abdominal pain
Anti-inflammatory: Suppresses NF-κB and inflammatory cytokines
Uterine effects: Can stimulate uterine contractions — explaining the pregnancy contraindication

Comparison with Similar Herbs

Herb	Temperature	Best For
Wu Zhu Yu	Hot	Vertex headache, cold vomiting, Jueyin cold
Rou Gui (Cinnamon Bark)	Hot	Kidney Yang deficiency, cold limbs, deep cold
Gan Jiang (Dried Ginger)	Hot	Spleen Yang deficiency, cold vomiting, diarrhea
Fu Zi (Aconite)	Very Hot	Yang collapse, extreme cold, severe pain

Key Takeaways

Wu Zhu Yu is one of TCM’s most intensely warming herbs, targeting the Liver, Stomach, and Spleen
It is the primary herb for Jueyin (vertex) headache with vomiting of clear fluid
Wu Zhu Yu Tang is the classic formula for cold headache and vomiting
The Zuo Jin Wan pairing with Huang Lian shows how its warmth can balance cold herbs
Must be processed before use, dosed conservatively, and never used during pregnancy

Disclaimer: This article is for educational purposes only. Wu Zhu Yu is a potent medicinal substance. Always consult a licensed TCM practitioner before use.