SP9 Yin Mound Spring

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

SP9 (Yīnlíngquán, “Yin Mound Spring”) is the He-Sea Point point of the Spleen Channel Meridian. It is located on the medial aspect of the lower leg, in the depression on the posterior and inferior border of the medial condyle of the tibia. This point is found by tracing the medial border of the tibia superiorly until the finger falls into a distinct depression just below the knee joint. It resolves dampness, opens and moves the water passages, benefits the lower jiao, relieves pain.

Location

On the medial aspect of the lower leg, in the depression on the posterior and inferior border of the medial condyle of the tibia. This point is found by tracing the medial border of the tibia superiorly until the finger falls into a distinct depression just below the knee joint.

Needling

Perpendicular insertion 1.0 to 2.0 cun.

TCM functions

Resolves dampness, opens and moves the water passages, benefits the lower jiao, relieves pain..

Indications

Abdominal distension, inability to lie down due to abdominal fullness, water swelling, diarrhea with undigested food, sudden diarrhea after eating, cholera, difficulty with urination, urinary incontinence, enuresis, painful urination (Qi Lin), pain in the genitals, pain in the lower abdomen, hardness and pain in the lower abdomen, hernia, cold and heat that is not regulated, pain in the knee, inability to bend and extend the knee, heat in the chest, pain in the heart and abdomen, heat disease with pain around the navel and chest fullness..

He-Sea PointWater Point

Clinical notes

As the He-Sea and Water point of the Spleen channel, Yinlingquan is the primary point for resolving dampness anywhere in the body. It is classically indicated for edema, abdominal distension, and urinary and digestive disturbances characterized by dampness, such as diarrhea and difficult urination. Its location also makes it a key local point for pain and restricted movement of the knee.

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 (Yīnlíngquán) is located on the medial aspect of the lower leg, in the depression on the posterior and inferior border of the medial condyle of the tibia. This point is found by tracing the medial border of the tibia superiorly until the finger falls into a distinct depression just below the knee joint.

What is SP9 used for?

SP9 resolves dampness, opens and moves the water passages, benefits the lower jiao, relieves pain. Common clinical indications include abdominal distension, inability to lie down due to abdominal fullness, water swelling, diarrhea with undigested food, sudden diarrhea after eating, cholera, difficulty with urination, urinary incontinence, enuresis, painful urination (Qi Lin), pain in the genitals, pain in the lower abdomen, hardness and pain in the lower abdomen, hernia, cold and heat that is not regulated, pain in the knee, inability to bend and extend the knee, heat in the chest, pain in the heart and abdomen, heat disease with pain around the navel and chest fullness.

How is SP9 needled?

Perpendicular insertion 1.0 to 2.0 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.