LI3 Third Space

Reviewed by · Licensed Acupuncturist & TCM Physician · Last reviewed June 2026

LI3 (Sān Jiān, “Third Space”) is the Shu-Stream point of the Large Intestine Meridian. It is located on the radial side of the index finger, proximal to the metacarpophalangeal joint, in the depression posterior to the joint. It clears heat, alleviates pain, benefits throat.

Location

On the radial side of the index finger, proximal to the metacarpophalangeal joint, in the depression posterior to the joint.

Needling

Perpendicular insertion 0.5-0.8 cun. Moxibustion is applicable.

TCM functions

Clears heat, alleviates pain, benefits throat.

Indications

Toothache, ophthalmalgia, sore throat, febrile diseases, pain and numbness of fingers.

Shu-Stream

Clinical notes

As a Shu-Stream point, LI-3 is effective for damp-heat conditions and joint pain along the Large Intestine meridian. It is particularly useful for clearing heat and alleviating pain in the throat, teeth, and eyes, especially when accompanied by swelling or redness. It also addresses pain and limited movement in the fingers and hand. For acute sore throat, it is often combined with LI-4 (Hé Gǔ).

On the Large Intestine channel

LI3 is one of 20 points on the Large Intestine Meridian. Nearby points:

Frequently asked questions

Where is LI3 located?

LI3 (Sān Jiān) is located on the radial side of the index finger, proximal to the metacarpophalangeal joint, in the depression posterior to the joint.

What is LI3 used for?

LI3 clears heat, alleviates pain, benefits throat. Common clinical indications include toothache, ophthalmalgia, sore throat, febrile diseases, pain and numbness of fingers.

How is LI3 needled?

Perpendicular insertion 0.5-0.8 cun. Moxibustion is applicable.

Which meridian is LI3 on?

LI3 is a point on the Large Intestine Meridian (Shǒu Yángmíng Dàcháng Jīng).

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⚠️ This page is for general education and is not medical advice. Acupuncture is a traditional practice; evidence varies by condition and study quality, and individual results differ. It does not replace diagnosis or treatment by a licensed professional. Always consult a qualified acupuncturist or physician.