What Taixi does
Taixi is treated here as a practical point rather than a curiosity: where it sits, how it is needled, what the tradition says it does, and the skin conditions in this database that name it.
Actions
- Tonifies Kidney Yin and Yang
- Strengthens the Kidney's receiving Lung Qi
- Benefits the Kidney Essence
- Benefits the lower back and knees
- Regulates the Uterus
Location
The written location is summarised from the classical record; use the landmark named there together with the diagram.
How to find it
Find the bony landmark first, then feel for the hollow or tender spot the location describes. The point is usually sensitive when pressed. Locate the tip of the medial malleolus and move your finger straight backwards towards the Achilles tendon, staying level with the tip. The point is the depression you can feel just ahead of the tendon, where the skin dips between the bone and the tendon. Pressing there usually produces a distinct soreness, and in many people the posterior tibial pulse can be felt in the same hollow.
Deqi
De qi at this point is felt as local distension, heaviness or aching, and may travel a short way along the channel.
A cun is a proportional body measurement, not a fixed length: one cun is about the width of the thumb at the knuckle, 1.5 cun about two finger widths, and 3 cun about the width of four fingers. On an average adult one cun is roughly one inch, but it scales with the person, which is why the texts measure in cun rather than centimetres.
Technique
Needling
Angle: 90 degrees, perpendicular Depth: Standard depth half a to one cun. Direction: Needle in the direction the location describes.
Moxibustion
The reference marks moxibustion as particularly recommended at this point and gives five to fifteen minutes. It is the method of choice when kidney yang deficiency and cold dominate, with cold knees, cold legs and frequent pale urine, and in that pattern moxa is used more often than the needle.
Cupping
Recorded in the reference as questionable at Taixi. The hollow is small, the tissue is thin and the posterior tibial artery and nerve pass through the area, so suction directly over the point is best avoided.
Gua sha
Recorded as questionable in the reference. The area is small and bony, with the tendon immediately behind it, so any scraping is better placed along the calf than across the point itself.
Bleeding
The classical records bloodletting here as questionable. The point sits over a pulse that can be felt with the fingers, and the tissue is thin, so this is not part of the standard approach described for it.
Skin uses
Taixi is the Yuan-source and Shu-stream point of the Kidney at the ankle, recorded to tonify Kidney Yin and Yang, strengthen the Essence and support the lower back. Its skin reasoning is deliberately broad and indirect: Kidney Yin and Essence are described as the deep moistening reserves, so where dry, thin or ageing skin is read as a Kidney pattern, the point is considered on that basis without any claim about a skin disease. The classical record includes a long list of internal indications, not a skin use. With no skin-specific classical indication recorded for it, the rationale relies on traditional inference, not trial evidence.
No skin-specific classical indication is recorded for this point. The rationale above is an indirect, traditional reading of the point, not a promise of benefit.
Point classifications
| Classification | Value |
|---|---|
| Five phase | Earth-Tu |
| Transporting type | Stream-Shu Point |
| Mother-child role | Mother (Tonifying) |
| Classical groups | Yuan-Source Point |
Classical record
The Kidney meridian exits at Taixi. Classical citation: the line places KI-3 as the Shu-Stream and Yuan-Source point where kidney qi gathers.
Ling Shu (Spiritual Pivot), classical citation recorded from the reference.
Taixi: mountain valleys connect to streams, streams connect to rivers. The Kidney stores the Will and favors stillness, emerging from the deep ravine to nourish the great will, hence called Taixi.
Hui Yuan Zhen Jiu Xue (Comprehensive Acupuncture), classical citation recorded from the reference.
Located behind the medial malleolus, above the calcaneus, in the depression where the artery pulsates.
Zhen Jiu Jia Yi Jing (Systematic Classic of Acupuncture), classical citation recorded from the reference.
The compendium lists a long range of indications: chronic malaria, cough, heart pain that feels like needle pricks, cold hands and feet reaching the joints, wheezing, vomiting, phlegm, a sticky mouth, frequent belching, cold hernia, fever without sweating, drowsiness, yellow urine, wasting and thirst, difficult defecation, swelling of the throat, coughing of blood and emaciation.
Zhen Jiu Da Cheng (Great Compendium of Acupuncture), classical citation recorded from the reference.
Safety
Who should treat this point
Acupuncture and moxibustion are practitioner procedures. This page is educational and is not a guide to self-treatment.
Caution
Safety flags: blood vessels lie close to the point; a nerve runs in the deeper layer; reduce depth in thin or older patients. Needle with care, adjust depth to the patient's build, and modify or avoid the point where a flag applies. Before needling, palpate the hollow for the posterior tibial pulse and plan the insertion so that the needle does not pass through the vessel, since the artery and its accompanying vein run through this gap. The tibial nerve lies in the same region, so a sharp radiating sensation means the needle should be withdrawn slightly. Tissue here is thin in older or wasted patients, and gentle manipulation suits them better than vigorous stimulation.
Deficiency and constitution
In a depleted patient the point is worked gently and briefly.
Before treatment
Educational reference only. Skin that is spreading, painful, blistering or accompanied by fever needs medical assessment.
Modern evidence and safety
General references for acupuncture safety and skin evidence. They are not specific to this point, and they are not a claim that needling it treats any condition.
- Acupuncture-related adverse events: systematic review and meta-analyses of prospective clinical studies. BMJ Open, 2021. PMID: 34489268.
- Acupuncture for atopic dermatitis: a systematic review and meta-analysis. BMJ Open, 2024. PMID: 39638592.
- Manual acupuncture for the treatment of chronic spontaneous urticaria: a systematic review and meta-analysis. International Journal of Surgery, 2025. PMID: 40696933.
- Acupuncture in Dermatology: An Update to a Systematic Review. Journal of Alternative and Complementary Medicine, 2021. PMID: 32955916.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
What does Taixi do in skin practice?
It is used where the skin picture includes the conditions it is used with, always as part of a combination chosen for the pattern.
Is it safe?
The posterior tibial artery and vein pass through this area. Palpate for the pulse before needling and avoid direct puncture of the vessel. The tibial nerve also runs through this region. Use gentle needling technique and avoid aggressive manipulation in patients with thin tissue or poor circulation.
Is Taixi needled or treated with moxa?
Both, depending on the pattern. The tradition describes needling as the usual method, with the needle held perpendicular and the arrival of qi awaited. Where cold and kidney yang deficiency dominate, moxibustion is used more often, commonly for five to fifteen minutes at a time. A practitioner decides between them after assessing whether heat signs such as night sweating and hot palms are present.
How do I find Taixi?
Start at the tip of the medial malleolus and slide your finger backwards towards the Achilles tendon, keeping level with the tip. The point lies in the hollow you can feel just in front of the tendon. It is usually sore when pressed, and in many people the posterior tibial pulse can be felt in the same place.
Why is the point called the Great Ravine?
The classical naming explained in the reference compares the channel to water, with valleys feeding streams and streams feeding rivers. The kidney, which stores the will and favours stillness, is said to come out of the deep ravine to nourish that will. Taixi means great ravine, and the name records the point as the place where the kidney qi surfaces.