The cooling point of the index finger. Erjian (LI-2) is a small but sharp point — it clears Heat and Fire from the Large Intestine channel, soothes sore throats and toothache, and calms the fever when the channel runs too hot.
Contraindications
LI-2 is a small, superficial point and generally very safe. As with all finger points, needling should stay within the stated shallow depth to avoid discomfort at the joint.
Name & story
The name 二间 Erjian means simply "Second Space" or "Second Interval" — the second hollow along the Large Intestine channel as it travels up from the fingertip. There is a quiet logic to it: the channel begins at LI-1 (Shangyang) at the very tip of the index finger, and one step further, at the second joint, lies Erjian — the next station on the road, the second gap between the bones. Simple and precise, the name is almost a map in two characters.
Point family & character
Erjian (LI-2) belongs to the Large Intestine Meridian (LI). In character it is the Ying-Spring point of the channel, and in Five-Element terms it is the Water point of a Metal channel. In classical theory, the Ying-Spring points are especially indicated for Heat conditions — the old teaching says: "for Heat in the body, use the Ying-Spring."
Five-element dynamics
The Large Intestine Meridian (LI) belongs to the Metal element, and LI-2 is its Water point — Water within Metal, the cooling, descending quality inside an already descending channel. When the Metal channel heats up — with inflammation, fever, sore throat or toothache driven by Heat or Wind-Heat — the Water point acts like a cool stream running through it, clearing the excess and restoring balance. This is the classic function of the Ying-Spring: to drain what is too hot.
Location
With the hand gently relaxed, find the knuckle of the index finger (the metacarpophalangeal joint). Erjian (LI-2) sits just in front of that knuckle — slightly toward the fingertip — on the thumb side of the index finger, right at the junction between the dorsal and palmar skin.
Anatomy & fascia
The point lies on the radial side of the index finger, just distal to the metacarpophalangeal joint, at the border of the dorsal and palmar skin.
Needling
The needle is inserted perpendicularly or at a slight angle, directed proximally.
Safe depth
0.2–0.3 Cun.
Moxa, cupping & Tui Na
Because LI-2 is used primarily for Heat conditions, warming therapies such as Moxa are generally not appropriate here. Firm acupressure or even gentle nail pressure on the point can provide quick relief in an acute situation — for instance, pressing it during a sudden bout of toothache or sore throat. Bloodletting at this point has also been used classically to clear Heat rapidly.
Functions
Clears Heat and disperses Wind-Heat from the Large Intestine channel and the face. Reduces fever. Soothes the throat and relieves pain. Benefits the teeth and gums. Opens and clears the sensory orifices of the face — eyes, nose, mouth. Calms acute inflammatory conditions along the channel pathway.
Indications
Sore throat, tonsillitis, toothache and swollen gums driven by Heat. Fever and febrile conditions, especially with Wind-Heat. Nosebleed (epistaxis). Eye redness and pain. Dry mouth and thirst. Pain and swelling of the index finger and hand. Facial swelling and pain along the Large Intestine channel pathway.
Mind & spirit (Shen)
LI-2 is not a primary point for the Shen, but there is a subtle connection worth noting: acute pain — a raging toothache, a burning throat — occupies the mind completely, leaving no room for calm or rest. By swiftly clearing the Heat and easing the pain, Erjian gives the mind back its space. Relief from sharp, acute suffering is itself a restoration of peace.
Point combinations
With LI-4 (Hegu) — the classic pairing for toothache, sore throat and facial pain along the channel. With LI-11 (Quchi) — to strengthen the clearing of Heat and reduce fever. With LI-1 (Shangyang) — for acute sore throat with Heat, both being distal points on the channel with a strong clearing action.
Clinical spotlight
Erjian (LI-2) is a point of acute, targeted action. Its real strength is speed — it is reached for in the clinic when there is clear Heat in the Large Intestine channel manifesting as sharp pain: a throbbing toothache, a fiery sore throat, a hot swollen finger. As the Ying-Spring point, it follows the classical principle that these small, distal points are among the most powerful for clearing channel Heat quickly. It is a compact, unassuming point, easy to miss on a chart, but valuable to know in exactly the right situation.
The golden tip
For a sudden toothache or sore throat with heat and swelling, find the point on the thumb side of the index finger, just in front of the knuckle. Press firmly with the opposite thumbnail for one to two minutes. It will not replace treatment, but it can take the edge off while you seek care. Because this is a Heat-clearing point, avoid warming it — no moxa or heat packs here.
For education only — not medical advice. Consult a qualified practitioner.