GB-20 (Feng Chi) Wind Pool

What does GB-20 Feng Chi do?

Feng Chi GB-20 is the principal point of the body for wind — both wind invading from outside and wind stirring within. It sits below the occiput on the Gall Bladder channel, at a meeting of that channel with the Sanjiao channel and with the Yang Motility (Yang Qiao) and Yang Linking (Yang Wei) vessels, which is why its reach extends well beyond the Gall Bladder itself.

• Eliminates exterior wind — the classical point for wind-cold and wind-heat invasion: the stiff, aching neck and occipital headache of a beginning common cold, aversion to cold, nasal congestion and fever.
• Extinguishes interior wind and subdues rising yang — for the dizziness, vertigo, tremor, visual disturbance and headache of Liver yang rising or Liver wind, and in the classical management of windstroke and its sequelae.
• Benefits the head and the eyes — one of the most heavily used points for eye disorders in the classical corpus: redness, pain, swelling, lacrimation, blurred and dim vision, night blindness.
• Clears the sense organs and the orifices of the head — tinnitus, deafness, nasal obstruction, loss of smell.
• Clears heat — used for febrile disease and for heat that has risen to the head.
• Calms the spirit and benefits the brain — recorded for insomnia, epilepsy, poor memory and agitation, on the reasoning that the Yang Motility and Yang Linking vessels which meet here govern the balance of yang and the ability to sleep.
• Activates the channel and relieves pain — the local action, for pain and rigidity of the neck and occiput and for pain radiating to the shoulder.

Source: Deadman & Al-Khafaji, A Manual of Acupuncture; Chinese Acupuncture & Moxibustion; Sacred Lotus sources & references; cross-referenced against multiple online sources.

What is GB-20 Feng Chi used for?

Feng Chi GB-20 is used above all for headache, for the neck, for the eyes, and for the onset of a common cold. The indications below are those recorded in the standard reference literature; they describe traditional use, not proven treatment.

• Headache, particularly occipital headache and headache of the whole head
• Migraine and one-sided headache along the Gall Bladder channel
• Pain and stiffness of the neck; inability to turn the head
• Dizziness and vertigo
• Common cold, with aversion to cold, fever and body aches
• Nasal obstruction, rhinorrhoea and loss of sense of smell
• Red, painful, swollen eyes and excessive lacrimation
• Blurred vision, dim vision and night blindness
• Glaucoma and other recorded eye disorders
• Tinnitus and deafness
• Insomnia
• Febrile disease without sweating
• Windstroke, hemiplegia and loss of speech following windstroke
• Convulsion, epilepsy and infantile convulsion
• Hypertension with dizziness and headache
• Pain of the shoulder and upper back along the channel

Source: Sacred Lotus sources & references (existing indication record); Deadman & Al-Khafaji, A Manual of Acupuncture; Chinese Acupuncture & Moxibustion.

How is GB-20 Feng Chi used in practice?

Feng Chi lies below the occiput, in the hollow between the origins of the sternocleidomastoid and the trapezius, roughly midway between Feng Fu DU-16 on the midline and Wan Gu GB-12 behind the ear. It is chosen whenever the diagnosis names wind — and because Chinese medicine uses "wind" for both an external pathogen and a pattern of internal movement, that covers an unusually wide clinical range.

• For an invasion of exterior wind — the classical opening combination is Feng Chi GB-20 with Feng Fu DU-16 and Feng Men BL-12, the three points whose names all carry the character for wind, together with Lie Que LU-07 and He Gu LI-04 to release the exterior.
• For headache and neck pain — with Tian Zhu BL-10 immediately medial to it on the Bladder channel, Jian Jing GB-21 on the shoulder, and the distal points Hou Xi SI-03 or Kun Lun BL-60. In migraine, with Tai Yang (the extra point at the temple) and Zu Lin Qi GB-41 or Xuan Zhong GB-39 on the same channel.
• For rising yang, dizziness and hypertension — with Tai Chong LIV-03 and Bai Hui DU-20 to subdue what has ascended, and with Feng Long ST-40 where phlegm is present.
• For eye disorders — with Jing Ming BL-01, Tai Yang and Guang Ming GB-37; GB-20 is regarded as a key distal-local point for the eyes because the Gall Bladder channel begins at the outer canthus.
• For sleep — with An Mian, the extra point held here just below and behind it, and with Shen Men HT-07; the Yang Motility vessel meeting here is the classical rationale.
• Among its category peers — GB-20 is one of a small group of points where a channel meets both the Yang Motility and Yang Linking vessels, which places it among the points used for one-sided and half-exterior, half-interior presentations.

Source: Deadman & Al-Khafaji, A Manual of Acupuncture; Chinese Acupuncture & Moxibustion; Sacred Lotus sources & references; cross-referenced against multiple online sources.

Where is GB-20 located?

• A Manual of Acupuncture (p. 436): Below the occiput, approximately midway between Fengfu DU-16 and Wangu GB-12, in the hollow between the origins of the sternomastoid and trapezius muscles.
• Chinese Acupuncture and Moxibustion (p. 213): In the depression between the upper portion of m. sternocleidomastoideus and m. trapezius, on the same level with Fengfu (GV 16).

How is GB-20 Feng Chi needled, and what is the risk?

Reference fact, stated plainly: GB-20 is among the most hazard-relevant points on the body. It sits below the occiput, and the standard references record that deep or wrongly angled insertion — particularly one directed upward and toward the midline — can pass through the foramen magnum and injure the medulla oblongata. The vertebral artery also runs close by as it curves over the atlas in the suboccipital region. Everything below is recorded as neutral reference data describing what the textbooks state. It is not instruction, and this page does not teach technique.

The angle the texts record

The direction of insertion is the safety-critical variable at this point, more than depth. The reference literature records the needle as being directed either toward the tip of the nose or toward the opposite (contralateral) eye. Both trajectories aim away from the midline and away from the foramen magnum. The trajectory the texts warn against is the opposite one: superiorly and medially, toward the midline of the skull base.

The depth the texts record

• Deadman & Al-Khafaji record oblique or perpendicular insertion directed toward the tip of the nose or the opposite eye, 0.5 to 1 cun.
• Chinese Acupuncture & Moxibustion records insertion toward the tip of the nose, 0.5 to 0.8 cun.
• Moxibustion is recorded as applicable.

Discrepancy flagged: the legacy needling entry held in Sacred Lotus sources & references for this point reads "puncture subcutaneously 0.3–0.5 inch", which describes a transverse, scalp-type insertion rather than the directed oblique insertion the published references record for GB-20. Our record is retained here and the published figures are given alongside it. The shallower figure is the more conservative of the two; the discrepancy is noted rather than silently resolved.

The documented hazard

This is not a theoretical concern. Serious traumatic complications of acupuncture at and around the suboccipital region are documented in the published case and review literature:

• A systematic review of 115 Chinese-language articles reporting 479 adverse events, including 14 deaths, classified the traumatic complications and found subarachnoid haemorrhage among both the most frequent and the most serious. The review's conclusion was that most of these events followed improper technique — that is, they were avoidable (Zhang et al., Bull World Health Organ 2010;88(12):915–921C, PMID 21124716, PMC2995190).
• A companion review of the Chinese literature covering 1956–2010 reached the same conclusion about traumatic central-nervous-system injury (J Altern Complement Med 2012, PMID 22967282).
• A review of rare but serious traumatic lesions from acupuncture catalogues injuries to the central nervous system among them (Acupunct Med 2001, PMID 11829156).
• Individual case reports include subarachnoid haemorrhage with spinal root injury caused by an acupuncture needle (Neurol Med Chir 1990, PMID 1710325) and acute cervical subdural haematoma as a complication of acupuncture (World Neurosurg 2016, PMID 27591101).

The risk in proportion

These events are rare. A meta-analysis of prospective clinical studies estimated serious adverse events at approximately 1 per 10,000 patients and around 8 per million treatments, with about half of all recorded events being bleeding, pain or flare at the needle site, and concluded that acupuncture is among the safer treatments in medicine — while noting that events requiring medical management do occur and require clinical competence (Bäumler et al., BMJ Open 2021;11:e045961, PMID 34489268). The recorded hazard at GB-20 is real, uncommon, and dependent on angle and depth; it is a reason this point is taught with particular care, and a reason it is not one to be approached without training.

Source: Deadman & Al-Khafaji, A Manual of Acupuncture; Chinese Acupuncture & Moxibustion; Sacred Lotus sources & references (existing needling record, flagged above); PubMed records cited above, each checked as active and not retracted.

What does the name Feng Chi mean?

Feng Chi means "Wind Pool" — a pool or reservoir in which wind gathers. The name is descriptive twice over: it marks the palpable hollow between the sternocleidomastoid and trapezius in which the point lies, and it records the classical view that the nape of the neck is where external wind first lodges when it invades the body. Sacred Lotus sources & references classify GB-20 as a Meeting Point of the Gall Bladder and Sanjiao channels with the Yang Motility and Yang Linking vessels.

Which other points carry "wind" in their names?

GB-20 belongs to a small named group whose members are all held here and all sit on the neck, upper back or behind the ear — the region the classics identify as wind's point of entry:

• Feng Fu DU-16, "Wind Mansion" — on the midline below the occiput, at the same level as GB-20
• Feng Men BL-12, "Wind Gate" — on the upper back beside the second thoracic vertebra
• Yi Feng SJ-17, "Wind Screen" — in the depression behind the earlobe

They are frequently used together at the onset of an exterior invasion.

Is there research on GB-20 Feng Chi?

GB-20 has an unusually strong point-specific research literature for an acupuncture point, chiefly in migraine, where it has been studied as the sole or principal stimulated point rather than as one item in a long protocol:

• Migraine mechanism, animal models. Electroacupuncture at Fengchi GB20 in a rat model of migraine induced by repeated stimulation of the superior sagittal sinus was reported to raise hind-paw and facial withdrawal thresholds and to reduce calcitonin gene-related peptide (CGRP) in the trigeminal ganglion, trigeminal nucleus caudalis and thalamus — CGRP being a target of current interest in migraine pharmacology (Zhao et al., Neural Regen Res 2017;12(5):804–811, PMID 28616038, DOI 10.4103/1673-5374.206652).
• A further rat study reported effects of electroacupuncture at Fengchi on facial allodynia and on microglial activation and microglia–neuron interaction (Brain Sci 2022, PMID 36009163), and a companion study examined the GB20 + Yang Ling Quan GB34 pairing on the same model (Brain Sci 2023, PMID 37190506).
• Cervicogenic headache, clinical. A meta-analysis of 20 randomised controlled trials reported higher total effective rates and greater visual-analogue-scale improvement with acupuncture than control, but the trials used multi-point protocols in which GB-20 is a near-universal component rather than the isolated variable, and the authors themselves reported evidence of publication bias (World Neurosurg 2024;189:166–173, PMID 38768751). This is protocol-level evidence and should not be read as evidence about GB-20 alone.

The honest summary is that the mechanistic work on GB-20 in migraine is point-specific and preclinical, while the clinical evidence is protocol-level. No well-powered clinical trial isolates this single point.

How does Feng Chi compare with the points near it?

Tian Zhu BL-10 lies medial to GB-20 on the Bladder channel and shares its occipital-headache and neck-stiffness use, but is weighted toward the Bladder channel's course over the head and toward the eyes and nose rather than toward wind as such. Feng Fu DU-16 sits on the midline at the same level, is a Point of the Sea of Marrow, and carries a comparable — arguably greater — caution about deep insertion because of its position directly over the foramen magnum. Wan Gu GB-12 lies laterally behind the mastoid on the same channel and is the more local choice for the ear and the side of the head. An Mian, the extra point held here in this region, is the modern point directed specifically at sleep.

Source: Deadman & Al-Khafaji, A Manual of Acupuncture; Chinese Acupuncture & Moxibustion; Sacred Lotus sources & references; PubMed records cited above, each checked as active and not retracted; cross-referenced against multiple online sources.