Hegu (LI4): The Master Point for Pain Relief

Introduction to Hegu

Hegu (合谷 LI4), meaning “Joining Valley,” is one of the most important and frequently used acupoints in Traditional Chinese Medicine. It is classified as the Yuan-Source point (原穴) of the Large Intestine Meridian and is renowned as one of the Four Command Points (四总穴) — a group of points that exert powerful influence over specific body regions.

The ancient saying captures its significance: “面口合谷收” — “For the face and mouth, Hegu is the point to use.” This means Hegu is the primary point for treating disorders of the head, face, and mouth.

Location

Hegu is located on the hand, in the web between the thumb and index finger:

Standard location: On the dorsum of the hand, between the 1st and 2nd metacarpal bones, approximately at the midpoint of the 2nd metacarpal bone on the radial side
Easy method: Place the thumb of one hand on the web between the thumb and index finger of the other hand. The point is where the tip of the thumb naturally rests when the thumb and index finger are pressed together

Attribute	Detail
Meridian	Large Intestine Meridian of Hand-Yangming (手阳明大肠经)
Point type	Yuan-Source point (原穴)
Command region	Face and mouth
Element	Fire (as Luo-Connecting point crosses to Lung)

Key Functions

Hegu has a wide range of clinical actions:

1. Relieve Pain and Promote Sweating

Hegu is the most important acupoint for analgesia in TCM. It strongly promotes the flow of Qi and Blood, opens the pores, and induces sweating — making it essential for treating exterior wind-cold and wind-heat patterns.

2. Clear Heat and Reduce Swelling

As a point on the Yangming meridian (which is rich in Qi and Blood), Hegu effectively clears heat, reduces inflammation, and resolves swelling — particularly in the face and head region.

3. Regulate the Face and Head

Through the Large Intestine Meridian’s pathway to the face, Hegu treats disorders of the eyes, ears, nose, mouth, and jaw. It is the command point for all facial conditions.

4. Regulate Qi and Blood

Hegu promotes the smooth circulation of Qi and Blood throughout the body, making it valuable for conditions involving stagnation and pain.

Clinical Applications

Headache

Hegu is the first-choice point for frontal and temporal headaches, especially those caused by external wind or Qi stagnation. It is commonly combined with:

Fengchi (GB20) — for wind-type headache
Taiyang (EX-HN5) — for temporal headache
Baihui (GV20) — for vertex headache

Toothache and Jaw Pain

Given its command over the mouth and face, Hegu is remarkably effective for:

Toothache (especially upper jaw)
TMJ (temporomandibular joint) pain
Gum swelling and inflammation
Often paired with Xiaguan (ST7) or Jiache (ST6)

Facial Paralysis (Bell’s Palsy)

Hegu is a core point in acupuncture protocols for facial paralysis, helping to:

Restore Qi and Blood flow to the face
Reduce inflammation of the facial nerve
Promote recovery of facial muscle function

Common Cold and Flu

Hegu’s sweating-inducing property makes it essential for:

Wind-cold patterns (chills, no sweating, stiff neck)
Wind-heat patterns (fever, sore throat, sweating)
Combined with Fengchi (GB20) and Dazhui (GV14) for exterior releasing

Dysmenorrhea and Labor

Hegu promotes the movement of Qi and Blood in the lower abdomen:

Effective for menstrual cramps when combined with Sanyinjiao (SP6)
Used in labor induction protocols (which is why it must be avoided during normal pregnancy)

The Four Gates: Hegu + Taichong

One of the most famous point combinations in TCM is Hegu (LI4) + Taichong (LR3), known as the “Four Gates” (四关穴):

Point	Meridian	Location
Hegu (LI4) × 2	Large Intestine	Hands
Taichong (LR3) × 2	Liver	Feet

This combination powerfully:

Moves Qi and Blood throughout the entire body
Relieves pain of virtually any kind
Calms the spirit and reduces stress, anxiety, and irritability
Clears heat and regulates Liver Qi

The Four Gates is one of the most widely used combinations in clinical acupuncture for pain management, emotional disorders, and systemic Qi stagnation.

Acupressure Self-Care

Hegu is one of the safest and most accessible points for self-treatment. Here is a step-by-step acupressure guide:

Technique

Position: Hold one hand with the palm facing down
Locate: Find the tender spot between the thumb and index finger, at the highest point of the muscle when the fingers are pressed together
Press: Use the thumb of the opposite hand to press firmly into the point
Motion: Apply steady pressure, then use small circular motions
Duration: Hold for 1–3 minutes per hand
Intensity: Press firmly enough to feel a dull ache — it should be tender but not painful

When to Use

Headache: Press both Hegu points simultaneously for 2–3 minutes
Toothache: Press the Hegu on the same side as the pain
Stress: Combine with Taichong (foot) for the Four Gates effect
Cold onset: Press firmly to encourage slight sweating

Frequency

2–3 times daily for chronic conditions; as needed for acute symptoms.

Moxibustion on Hegu

Moxibustion is effective for:

Chronic facial conditions (Bell’s palsy recovery)
Cold-type toothache (pain worsened by cold)
Qi deficiency with facial pallor
Weak immunity and frequent colds

Use mild moxa for 5–10 minutes per point. The warming effect helps unblock meridians and strengthen defensive Qi.

Precautions

Situation	Guidance
Pregnancy	Contraindicated — Hegu can stimulate uterine contractions and induce labor. Avoid during all trimesters unless intentionally used for labor induction under medical supervision
Open wounds	Do not apply acupressure over broken skin
Severe bleeding disorders	Use caution with acupuncture
After meals	Wait at least 30 minutes before strong acupressure
Over-stimulation	Excessive pressure may cause bruising or soreness — moderate your intensity

Key Takeaways

Hegu (LI4) is the command point for the face and mouth — the primary point for headache, toothache, and facial disorders
It strongly relieves pain, promotes sweating, and clears heat
The Four Gates combination (Hegu + Taichong) is one of the most powerful point pairs in TCM
Easy to locate and ideal for self-acupressure
Must be avoided during pregnancy due to labor-inducing effects

Disclaimer: This article is for educational purposes only. Acupuncture should be performed by a licensed practitioner. If you are pregnant, do not stimulate Hegu without professional guidance.