GB20 (Fengchi / Wind Pool) Acupuncture Point Guide: Location, Functions and Safety

Practitioner Guide from The Acupuncture Supply Co.
Professional acupuncture supplies and practical clinical resources for qualified practitioners in Ireland and across Europe.

GB20, known as Fengchi (“Wind Pool”), is a major point of the Gallbladder channel at the base of the skull. It is traditionally selected in treatment strategies involving Wind, the head and sensory orifices, Shaoyang presentations and tension or restriction through the occipital and cervical region.

Because GB20 lies in the posterior neck near important neurological and vascular structures, accurate landmarking, conservative technique and sound anatomical training are essential. This guide provides a concise practitioner reference rather than a universal needling prescription.

GB20 Fengchi quick reference

Point name	GB20 — Fengchi (“Wind Pool”)
Channel	Gallbladder channel of Foot Shaoyang
Classification	Meeting point of the Gallbladder channel with the Yang Linking (Yang Wei) and Yang Motility (Yang Qiao) vessels
Region	Posterior neck, inferior to the occipital bone
Laterality	Bilateral
Core landmark	The depression between the upper attachments of the sternocleidomastoid and trapezius muscles

Location of GB20 Fengchi

The World Health Organization standard locates GB20 in the posterior neck, inferior to the occipital bone, in the depression between the origins of the sternocleidomastoid and trapezius muscles. It lies at approximately the same horizontal level as GV16.

How to locate GB20

1. Position the patient so the head and neck are comfortably supported and the upper cervical tissues are relaxed.
2. Identify the base of the occipital bone and the mastoid region.
3. Palpate the upper attachment of the sternocleidomastoid laterally and the upper trapezius attachment more medially.
4. Locate the palpable depression between these muscular landmarks, immediately inferior to the occipital bone.
5. Compare both sides and confirm the anatomy by palpation rather than relying on a surface illustration alone.

GB20 should not be confused with GB12, which lies posterior and inferior to the mastoid process, or BL10, which is located more medially in the posterior neck.

Traditional functions of GB20

Within traditional East Asian medicine, GB20 is commonly described as having the following functions:

• Expels exterior Wind.
• Pacifies interior Wind.
• Clears the head and benefits the sensory orifices.
• Benefits the eyes.
• Clears Heat and subdues rising Yang in an appropriate pattern presentation.
• Activates the channel and eases traditional patterns of pain or stiffness affecting the head and neck.
• Supports treatment strategies involving the Shaoyang and Yang Linking vessel.

These are traditional descriptions used in acupuncture theory. They should not be interpreted as claims that GB20 has been proven to diagnose, prevent or cure a medical condition.

Traditional clinical applications

GB20 may be considered within an individualised treatment plan when pattern differentiation and clinical assessment indicate presentations involving:

• Occipital, temporal or generalised headache patterns.
• Dizziness or vertigo within a relevant traditional diagnosis.
• Neck pain, upper-cervical restriction or stiffness.
• Exterior Wind presentations with symptoms affecting the head and neck.
• Interior Wind or rising Yang patterns.
• Eye, ear or nasal symptoms that fit the practitioner’s complete pattern assessment.
• Shaoyang presentations involving the lateral head and neck.

Headache, dizziness, visual change, imbalance and neck pain can also indicate conditions requiring medical investigation. GB20 should not be treated as a stand-alone response to unexplained, sudden, severe or progressive symptoms.

Common point combinations

Depending on the presentation and treatment principles, GB20 is traditionally combined with points such as:

• GB20 + LI4: traditionally considered for exterior Wind and headache presentations.
• GB20 + LV3: commonly selected where interior Wind or rising Yang forms part of the pattern.
• GB20 + BL10: used in strategies addressing the occipital region and neck stiffness.
• GB20 + Taiyang: considered for temporal or lateral headache patterns.
• GB20 + SJ5: used in some Shaoyang and Yang Linking vessel strategies.
• GB20 + GB34: considered where Gallbladder channel or sinew involvement is clinically relevant.

These combinations are traditional examples, not fixed prescriptions. Selection should be adapted to the patient, the complete diagnosis and the practitioner’s accredited training.

Anatomy and practitioner notes

• Use the occipital bone, mastoid region and muscular borders as the principal landmarks.
• Palpate gently for local tenderness, tissue tone, asymmetry and vascular pulsation before deciding on technique.
• Relevant superficial structures can include branches of the occipital nerves and the occipital vessels.
• Deeper structures in the posterior neck include the suboccipital musculature, upper cervical structures, vertebral artery and central nervous system structures.
• Anatomical proportions and tissue depth vary with body size, sex, age, posture and individual anatomy. Published imaging research does not support treating one numerical depth as universally safe.
• Assess the area for infection, wounds, inflammation, swelling, bruising, recent trauma, surgery or altered sensation.
• Consider anticoagulant or antiplatelet medication, bleeding disorders, frailty and other patient-specific risk factors.
• Document assessment, consent, positioning, point selection, technique and response in accordance with applicable professional standards.

Needling and essential safety

GB20 is a posterior-neck point requiring advanced anatomical awareness. Inappropriate direction or excessive depth can endanger vascular, neurological or central nervous system structures. Serious adverse events involving posterior-neck acupuncture have been reported, even though serious complications remain uncommon overall.

Needling angle, depth, stimulation and patient position must therefore be determined by a qualified practitioner working within accredited training, scope of practice and patient-specific assessment. This guide deliberately does not provide a universal angle or depth.

• Do not needle GB20 without specific training in the regional anatomy and safe technique.
• Avoid blind deep or aggressively directed insertion.
• Do not needle through infected, damaged or otherwise unsuitable skin.
• Use sterile, single-use needles and appropriate hand hygiene, clean-field and sharps-disposal procedures.
• Stop and reassess immediately if the patient experiences unusual severe pain, electric shock-like sensation, marked dizziness, neurological symptoms or other unexpected responses.

When urgent medical assessment takes priority

Do not manage a presentation as routine musculoskeletal tension or a familiar headache pattern when there is a sudden severe headache, new weakness or numbness, facial asymmetry, difficulty speaking or swallowing, double vision, loss of coordination, collapse, new severe vertigo, recent significant neck trauma or another acute neurological or vascular warning sign. Follow local emergency and referral procedures.

Research note

GB20 is included in research protocols for several head, neck and neurological symptom presentations. However, a multi-point acupuncture trial does not establish the independent effect of one point, and evidence varies by condition, study quality and comparator. Traditional applications and emerging clinical research should therefore be described separately.

Frequently asked questions

Where exactly is GB20 located?

GB20 is below the occipital bone in the posterior neck, in the palpable depression between the upper sternocleidomastoid and trapezius attachments. It is located bilaterally.

What does Fengchi mean?

Fengchi is usually translated as “Wind Pool”. The name reflects the point’s traditional association with exterior and interior Wind patterns affecting the head and neck.

Is GB20 normally used on both sides?

It is a bilateral point and is often considered on both sides, but laterality and technique should follow the individual assessment rather than a fixed rule.

Can patients use this guide for self-treatment?

No. This is a professional reference and not a self-needling guide. The posterior neck contains important vascular and neurological structures.

Can GB20 be used for every headache or episode of dizziness?

No. Point selection depends on assessment and pattern differentiation, and some headache or dizziness presentations require medical investigation or urgent care.

Continue exploring Project Lotus

Visit our Acupuncture Point Guides, read our KD3 / KI3 Taixi Guide, or browse our collection of professional acupuncture needles.

Practitioners can also compare our ORCA silver-handle needles with guide tube and ORCA copper-handle needles with guide tube.

---

Professional disclaimer: This article is provided for qualified acupuncture and healthcare practitioners for general educational purposes. Traditional actions and applications describe established acupuncture theory and are not claims of proven clinical efficacy. The content is not medical advice, does not replace accredited training and should not be used as a universal treatment protocol. Practitioners remain responsible for assessment, consent, safe technique, infection control, record keeping, referral and compliance with their professional and legal obligations.

Reference standards and safety reading:
World Health Organization. WHO Standard Acupuncture Point Locations in the Western Pacific Region.
World Health Organization. Guidelines on Basic Training and Safety in Acupuncture.
Chou PC, et al. Safe needling depth of acupuncture points.
Lin JG. An exploration of the needling depth in acupuncture.
Zhang J, et al. Acupuncture-related adverse events: a systematic review of the Chinese literature.
National Center for Complementary and Integrative Health. Acupuncture: Effectiveness and Safety.