SP6 (Sanyinjiao) Acupuncture Point: Location, Functions and Clinical Applications

SP6 (Sanyinjiao) Acupuncture Point:

Introduction

SP6, known as Sanyinjiao, is one of the most important acupuncture points on the Spleen meridian. Widely used in both traditional and modern acupuncture practice, SP6 is valued for its ability to harmonise the Spleen, Liver and Kidney systems. As the meeting point of the three yin channels of the leg, it has a broad range of clinical applications and is frequently selected for digestive, gynaecological, urological, emotional and sleep-related disorders.

For students and practitioners alike, SP6 is considered one of the most versatile and commonly used points in Traditional Chinese Medicine.

Point Details

Point Name: SP6 (Sanyinjiao)

Chinese Name: 三阴交

Meridian: Spleen Meridian of Foot Taiyin

Point Category:

• Meeting Point of the Spleen, Liver and Kidney Channels

Location

SP6 is located on the medial aspect of the lower leg.

Traditional location:

• 3 cun directly above the prominence of the medial malleolus

• Posterior to the medial border of the tibia

The point is typically found in a tender depression just behind the tibial border.

Traditional Functions

Tonifies the Spleen and Stomach

SP6 strengthens the Spleen's ability to transform and transport fluids and nutrients, making it valuable for digestive weakness and fatigue.

Resolves Dampness

The point is commonly used when Dampness contributes to symptoms such as oedema, heaviness, loose stools and urinary difficulties.

Nourishes Blood and Yin

SP6 is frequently selected in patterns involving Blood deficiency and Yin deficiency.

Regulates the Liver

By supporting the smooth flow of Liver Qi, SP6 may help address emotional tension, irritability and stress-related disorders.

Supports Kidney Function

The point is widely used to strengthen Kidney Yin and support reproductive and urinary health.

Common Indications

Women's Health

• Irregular menstruation

• Dysmenorrhoea

• Amenorrhoea

• Menopausal symptoms

• Fertility support

Digestive Disorders

• Abdominal bloating

• Loose stools

• Poor appetite

• Chronic digestive weakness

Sleep and Emotional Health

• Insomnia

• Anxiety

• Stress-related disorders

• Restlessness

Urinary and Reproductive Disorders

• Frequent urination

• Difficult urination

• Reproductive health concerns

Needling Technique

Insertion

• Perpendicular insertion

• Typical depth: 1–1.5 cun

Deqi Sensation

Patients may experience a sensation of heaviness, distension or radiating warmth along the channel.

Moxibustion

SP6 is commonly used with moxibustion when treating deficiency and cold patterns.

Clinical Applications

Gynaecological Conditions

SP6 is among the most frequently selected acupuncture points for menstrual and reproductive health disorders.

Stress and Emotional Regulation

By influencing both Liver and Spleen function, SP6 is often incorporated into treatments for stress-related presentations.

Sleep Disorders

The point is widely used as part of protocols addressing insomnia and disturbed sleep.

Digestive Support

SP6 is often combined with ST36 and CV12 when supporting digestive function.

Common Point Combinations

SP6 + ST36

A classic combination for strengthening Qi, Blood and digestive function.

SP6 + LV3

Frequently used for emotional stress and Liver Qi stagnation.

SP6 + KI3

Used to nourish Yin and support Kidney function.

SP6 + HT7

A common combination for insomnia and emotional imbalance.

Contraindications and Cautions

Important: SP6 is traditionally contraindicated during pregnancy because of its strong influence on the uterus.

Practitioners should exercise appropriate clinical judgement and follow established safety guidelines.

Conclusion

SP6 (Sanyinjiao) is one of the most versatile acupuncture points in clinical practice. As the meeting point of the Spleen, Liver and Kidney channels, it offers broad therapeutic potential across digestive, reproductive, emotional and sleep-related disorders. Its ability to nourish Blood, strengthen Yin and harmonise multiple organ systems ensures that SP6 remains a fundamental point in both traditional and modern acupuncture treatment 

Practitioner Disclaimer

This guide is intended for qualified acupuncture and healthcare practitioners. It is provided for educational and professional reference only and should not be used as a substitute for appropriate clinical training, medical diagnosis or individualised treatment planning.

Acupuncture points should only be needled by suitably trained practitioners using sterile, single-use acupuncture needles and safe clinical technique. Point selection, needling depth, angle and stimulation should always be adapted to the individual patient, their constitution, medical history and presenting condition.

Patients with serious, persistent or worsening symptoms should be referred for appropriate medical assessment. Acupuncture should not be used as a substitute for urgent or emergency medical care.