SI1 Lesser Marsh

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

SI1 (Shaoxe, “Lesser Marsh”) is the Jing-Well (Metal) point of the Small Intestine Channel Meridian. It is located on the ulnar side of the little finger, approximately 0.1 cun posterior to the corner of the nail. It clears heat, benefits the breast, and promotes lactation.

Location

On the ulnar side of the little finger, approximately 0.1 cun posterior to the corner of the nail.

Needling

Perpendicular or oblique insertion 0.1-0.2 cun, or prick to bleed.

TCM functions

Clears heat, benefits the breast, and promotes lactation.

Indications

Headache, febrile diseases, insufficient lactation, mastitis, sore throat, deafness, tinnitus.

Jing-Well (Metal)Entry/Exit

Clinical notes

SI1, a Jing-Well (Metal) point, is primarily known for its powerful action in promoting lactation and resolving breast issues, especially insufficient lactation or mastitis. As a Jing-Well point, it is also used to clear heat from the opposite end of the meridian, making it effective for headaches and febrile diseases. It is empirically used with BL67 to turn a malpositioned fetus.

On the Small Intestine Channel channel

SI1 is one of 19 points on the Small Intestine Channel Meridian. Nearby points:

Frequently asked questions

Where is SI1 located?

SI1 (Shaoxe) is located on the ulnar side of the little finger, approximately 0.1 cun posterior to the corner of the nail.

What is SI1 used for?

SI1 clears heat, benefits the breast, and promotes lactation. Common clinical indications include headache, febrile diseases, insufficient lactation, mastitis, sore throat, deafness, tinnitus.

How is SI1 needled?

Perpendicular or oblique insertion 0.1-0.2 cun, or prick to bleed.

Which meridian is SI1 on?

SI1 is a point on the Small Intestine Channel Meridian (Shǒu Tài Yáng Xiǎo Cháng 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.