SP9 Yin Mound Spring

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

SP9 (Yīnlíngquán, “Yin Mound Spring”) is the He-Sea (Water) point of the Spleen Channel Meridian. SP9 is located on the medial aspect of the lower leg, in the depression posterior and inferior to the medial condyle of the tibia. It resolves dampness, benefits urination, strengthens the Spleen.

Location

SP9 is located on the medial aspect of the lower leg, in the depression posterior and inferior to the medial condyle of the tibia.

Needling

Perpendicular insertion 1-1.5 cun.

TCM functions

Resolves dampness, benefits urination, strengthens the Spleen.

Indications

Edema, urinary retention, difficult urination, knee pain, abdominal distention.

He-Sea (Water)Five-Shu

Clinical notes

SP9 is the He-Sea (Water) point of the Spleen meridian and is renowned as the most important point for resolving dampness from any part of the body. It is extensively used for edema, urinary dysfunction (difficulty, retention, or incontinence), diarrhea, and damp-heat conditions in the lower jiao such as leucorrhea or painful urination. Its ability to strengthen the Spleen's transforming and transporting function makes it crucial for systemic dampness. It is often paired with Ren9 for severe edema.

On the Spleen Channel channel

SP9 is one of 21 points on the Spleen Channel Meridian. Nearby points:

Frequently asked questions

Where is SP9 located?

SP9 is located on the medial aspect of the lower leg, in the depression posterior and inferior to the medial condyle of the tibia.

What is SP9 used for?

SP9 resolves dampness, benefits urination, strengthens the Spleen. Common clinical indications include edema, urinary retention, difficult urination, knee pain, abdominal distention.

How is SP9 needled?

Perpendicular insertion 1-1.5 cun.

Which meridian is SP9 on?

SP9 is a point on the Spleen Channel Meridian (Zú Tài Yīn Pí 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.