Jia Cheng Jiang Adjacent to the Container of Fluids

What does Jia Cheng Jiang do?

Jia Cheng Jiang expels wind from the face and alleviates pain, and activates the local channel — an extra point on the chin over the nerve that supplies the lower lip.

• Expels wind from the face and alleviates pain — the wind action for facial pain and the mobile signs of facial palsy
• Activates the local channel — for deviation of the mouth and eye in facial paralysis
• Relieves facial pain along the lower jaw — including trigeminal neuralgia affecting the chin and lower-lip region
• A local point for toothache and swollen, painful gums

The point sits over the mental foramen — and that explains it. Jia Cheng Jiang (“beside Cheng Jiang”) lies just to the side of REN-24 Cheng Jiang on the chin, directly over the mental foramen — the little hole in the jaw where the mental branch of the trigeminal nerve emerges to supply the lower lip and chin. That anatomy is exactly why the point treats trigeminal neuralgia of the lower face, facial palsy, and lower-tooth-and-gum pain: it sits on the very nerve involved.

A note carried from our own review. Our records flag that reputable sources consistently list trigeminal neuralgia (not TMJ / jaw-joint disorder) as this point’s classic indication, consistent with its position over the mental nerve; an older TMJ note could not be independently verified and is left disclosed rather than asserted. We follow that: the mental-nerve, trigeminal-neuralgia use is the grounded one.

On the name. “Jia Cheng Jiang” means Beside / Adjacent to Cheng Jiang — jia to flank or be beside, and Cheng Jiang the neighbouring point REN-24 (“Container of Fluids”, the chin hollow that catches dribbled liquid).

Source: Sacred Lotus sources & references (extra-point action, location and translation records; the REN-24 record queried against our own data; the trigeminal-vs-TMJ discrepancy retained), cross-referenced against multiple online sources.

What is Jia Cheng Jiang used for?

Jia Cheng Jiang is used for deviation of the mouth and eye, facial pain, toothache, swollen gums, and (in our record) jaundice; it is commonly used for facial paralysis and lower-face nerve pain. Our own indication record is reproduced here in full.

• Deviation of the mouth and eye (facial paralysis)
• Pain of the face — especially trigeminal neuralgia of the lower jaw and chin
• Toothache and swelling of the gums
• Jaundice (a classical entry)

The lower face, around the mental nerve. The mouth-and-eye deviation is the facial-palsy action; the facial pain is the trigeminal-neuralgia action over the mental nerve; the tooth-and-gum entries are local. The jaundice entry is a classical inclusion less obviously tied to the point’s local anatomy.

An honest and necessary note. A NEW FACIAL DROOP OR DEVIATION OF THE MOUTH REQUIRES URGENT ASSESSMENT — stroke and Bell’s palsy both need same-day care. Trigeminal neuralgia requires medical diagnosis; it is treated with specific medication, and a first presentation needs assessment. Toothache with facial swelling and fever is a medical emergency. Jaundice (yellowing of the skin or eyes) always requires prompt medical assessment. This record documents classical use only.

How it is combined. With REN-24 Cheng Jiang beside it, ST-04 Di Cang and ST-06 Jia Che for facial palsy, and LI-04 He Gu distally. All held here.

Source: Sacred Lotus sources & references (extra-point indication and action records; the LI-04, REN-24, ST-04 and ST-06 records queried from our own data), cross-referenced against multiple online sources.

Where is Jia Cheng Jiang located?

Jia Cheng Jiang is on the chin, one cun to the side of the midline chin point REN-24, over the little hole in the jaw where the chin nerve emerges.

• 1 cun lateral to REN-24 Cheng Jiang (the midline point in the chin hollow below the lower lip)
• Over the mental foramen — often felt as a slight depression, and tender when the underlying nerve is irritated

The mental foramen is the target. REN-24 sits in the midline groove of the chin; moving one cun to the side reaches Jia Cheng Jiang, over the mental foramen. In trigeminal neuralgia the spot is frequently tender, which helps confirm the location. It is a paired point (one on each side).

On the name. “Jia Cheng Jiang” — Beside Cheng Jiang, as noted above.

Source: Sacred Lotus sources & references (extra-point location and translation records, retained unchanged; the REN-24 record queried from our own data).

• A Manual of Acupuncture (p. 570): 1 cun lateral to Chengqiang (REN-24), over the mental foramen.

How is Jia Cheng Jiang needled?

Our own record gives two methods: a perpendicular-oblique insertion aimed medially and downward into the mental foramen, 0.3–0.5 cun; or a transverse insertion of 0.5–1.5 cun. What follows is a neutral record of what the reference literature documents. It is not instruction, and this page does not teach technique.

• Angle and depth as recorded: perpendicular-oblique, medially and inferiorly toward the mental foramen, 0.3–0.5 cun; or transverse, 0.5–1.5 cun, along the jaw.
• Moxibustion: not emphasised; moxa on the face is used sparingly for cosmetic reasons.
• Regional anatomy: the point overlies the mental foramen of the mandible; the mental nerve and the mental (labial) vessels emerge here; the jawbone is immediately deep.

Hazard, stated proportionately. This is a low-hazard point at its shallow depth: bone close beneath, no cavity, no organ. Directing a needle into the mental foramen touches the nerve directly and produces a strong, sometimes electric sensation — deliberate in some techniques, but a reason for care. The face is vascular and bruises readily. Our record carries no arterial caution at Jia Cheng Jiang.

What is not claimed. No safe-depth study could be located, and none is borrowed. No case report naming this point was located.

Source: Sacred Lotus sources & references (extra-point needling record, retained unchanged, against our own data), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on Jia Cheng Jiang, and what should a reader know?

No trial isolates Jia Cheng Jiang. Where it appears it is one component of a facial-palsy or facial-pain protocol, and a study that includes a point in a protocol is not evidence about that point.

What this page can state with confidence. Jia Cheng Jiang (“Beside Cheng Jiang”, EX-HN-19) is an extra point on the chin over the mental foramen, where the mental branch of the trigeminal nerve emerges — which is exactly why it treats trigeminal neuralgia of the lower face, facial palsy, and lower-tooth-and-gum pain. Our review notes trigeminal neuralgia (not TMJ) as the grounded indication given that anatomy.

A safety note. A new facial droop, trigeminal neuralgia, and jaundice are all matters for medical assessment; this page records classical use and says so.

A note on searching for it. Jia Cheng Jiang is coded EX-HN-19 (older texts: M-HN-18). Any claim should be checked against what a study actually used.

Source: Sacred Lotus sources & references (extra-point action, indication and location records; the REN-24 record queried, against our own data).