CV6 (Qihai / Sea of Qi) Acupuncture Point Guide

Practitioner Guide from The Acupuncture Supply Co.
Professional acupuncture supplies and practical clinical resources for qualified practitioners in Ireland and across Europe.

CV6, also written as REN6 and known as Qihai (“Sea of Qi”), is a point on the Conception Vessel in the lower abdomen. Within traditional East Asian medicine, it is strongly associated with supporting original Qi, tonifying Qi and Yang, regulating the lower Jiao, consolidating deficiency and addressing sinking Qi when the complete pattern supports its use.

CV6 has a simple surface description, but safe clinical use requires more than measuring below the umbilicus. Abdominal-wall thickness, pregnancy, bladder distension, previous surgery, hernia, scars, altered sensation and the position of deeper peritoneal structures must all inform the technique. This guide is a professional reference for appropriately trained practitioners, not a universal needling prescription or a self-treatment guide.

CV6 Qihai quick reference

Point name	CV6 / REN6 — Qihai (“Sea of Qi”)
Vessel	Conception Vessel (Ren Mai)
Classification	Conception Vessel point; traditionally regarded as an important point for Qi and the lower Jiao
Region	Lower abdomen
Laterality	Single midline point
Core landmark	On the anterior median line, 1.5 B-cun inferior to the centre of the umbilicus

Location of CV6 Qihai

The World Health Organization standard locates CV6 on the lower abdomen, 1.5 B-cun inferior to the centre of the umbilicus, on the anterior median line.

How to locate CV6

1. Position the patient comfortably supine, with the abdomen relaxed and appropriately draped.
2. Identify the centre of the umbilicus and the anterior median line.
3. Establish the proportional distance between the centre of the umbilicus and the superior border of the pubic symphysis, measured as 5 B-cun.
4. Measure 1.5 B-cun inferiorly from the umbilicus along the midline.
5. Inspect and palpate gently for scars, hernia, tenderness, masses, pulsation, distension, skin change or unexpected anatomy before selecting any technique.

CV6 lies between CV7, 1 B-cun below the umbilicus, and CV5, 2 B-cun below it. CV4 Guanyuan is farther inferior at 3 B-cun below the umbilicus. Finger-width estimates are unreliable because hand and body proportions differ; use the patient’s proportional measurement.

Traditional functions of CV6

Within traditional East Asian medicine, CV6 is commonly described as having the following functions:

• Tonifies Qi and supports original Qi.
• Strengthens Yang within an appropriate deficiency pattern.
• Regulates and moves Qi in the lower abdomen.
• Regulates the lower Jiao and supports water metabolism.
• Consolidates and secures in deficiency presentations.
• Raises sinking Qi when selected within an appropriate treatment strategy.
• Supports Kidney function, Jing and reproductive health within traditional theory.
• Harmonises Blood in selected lower-abdominal and gynaecological patterns.

These are traditional descriptions used in acupuncture theory. They should not be interpreted as claims that CV6 has been proven to diagnose, prevent or cure fatigue, gastrointestinal, urinary, reproductive or another medical condition.

Traditional clinical applications

CV6 may be considered within an individualised treatment plan when assessment and pattern differentiation indicate presentations involving:

• Fatigue, weakness or reduced resilience associated with Qi deficiency.
• Coldness or weakness associated with Yang deficiency.
• Lower-abdominal discomfort, distension or cold within a relevant traditional diagnosis.
• Chronic loose stools or digestive weakness where Spleen and original Qi support forms part of the strategy.
• Urinary frequency, leakage or difficulty within an appropriate lower-Jiao pattern.
• Menstrual, reproductive or postpartum deficiency presentations.
• Prolapse or sinking Qi patterns as part of a complete treatment plan.
• Constitutional or convalescent deficiency when serious underlying causes have been assessed appropriately.

Fatigue, abdominal or pelvic pain, altered bowel or bladder function, abnormal bleeding and pregnancy-related symptoms may require medical investigation. CV6 must not be used as a stand-alone response to new, severe, unexplained or progressive symptoms.

Common point combinations

Depending on the presentation and treatment principles, CV6 is traditionally combined with points such as:

• CV6 + ST36: commonly selected to support Qi, digestion and constitutional strength.
• CV6 + CV4: traditionally considered where original Qi, Kidney deficiency, Jing or the lower Jiao are treatment priorities.
• CV6 + BL23: used in strategies supporting Kidney and original Qi from the anterior and posterior aspects.
• CV6 + SP6: considered in selected lower-Jiao, fluid, menstrual or deficiency patterns.
• CV6 + KD3: traditionally selected where Kidney deficiency forms part of the diagnosis.
• CV6 + GV20: considered in some strategies for sinking Qi or prolapse, alongside appropriate medical assessment.

These combinations are traditional examples, not fixed prescriptions. Selection, stimulation, sequencing and treatment frequency should be adapted to the patient, pregnancy status, complete diagnosis and the practitioner’s accredited training.

Anatomy and practitioner notes

• CV6 lies on the linea alba region of the anterior abdominal wall.
• Layers deep to the skin and subcutaneous tissue may include aponeurotic tissue, transversalis fascia, extraperitoneal tissue and parietal peritoneum; bowel or a distended bladder may lie deeper.
• Abdominal-wall thickness varies substantially with body habitus, muscle tone, age, posture, pregnancy and previous surgery.
• Ask about pregnancy or possible pregnancy, recent childbirth, abdominal or pelvic surgery, hernia, mesh, stoma, implanted devices, scars, unexplained masses, ascites and current abdominal or urinary symptoms.
• Assess whether the bladder may be distended and allow the patient to void when clinically appropriate before treatment.
• Inspect and palpate for tenderness, guarding, pulsation, swelling, infection, bruising, skin damage, altered sensation or unexpected anatomy.
• Consider anticoagulant or antiplatelet medication, bleeding disorders, frailty, vasovagal history and needle sensitivity.
• Maintain respectful draping, clear consent and communication throughout assessment and treatment of the lower abdomen.
• Document assessment, consent, pregnancy screening, point selection, technique and response in accordance with applicable professional standards.

Needling and essential safety

CV6 is a lower-abdominal point requiring specific anatomical and clinical judgement. Angle, depth and stimulation should be selected according to accredited training, the patient’s individual abdominal wall, bladder status, medical history and treatment intention. This guide deliberately does not prescribe a universal angle or depth.

• Avoid deep, uncontrolled or forceful insertion: excessive depth can enter the peritoneal cavity and threaten underlying viscera.
• Do not needle through infection, inflammation, wounds, bruising, an active hernia, unexplained swelling or other unsuitable tissue.
• Do not needle over uncertain post-surgical anatomy, mesh, a stoma, implanted device or an unexplained abdominal mass without appropriate clarification.
• Lower-abdominal needling during pregnancy requires specific obstetric acupuncture training, a clear clinical rationale and adherence to recognised pregnancy-safety guidance. Avoid routine use where pregnancy is possible but unconfirmed.
• Use sterile, single-use acupuncture needles and appropriate hand hygiene, clean-field and sharps-disposal procedures.
• Stop and reassess if the patient experiences sharp, severe or increasing abdominal pain, guarding, shoulder-tip pain, marked dizziness, faintness, unusual bleeding or another unexpected response.

Moxibustion

Moxibustion is traditionally considered at CV6 in selected Cold, Yang-deficient or Qi-deficient patterns when clinically appropriate and within the practitioner’s training. Maintain continuous supervision and protect the skin. Avoid moxa where sensation is impaired, skin is inflamed or damaged, the patient cannot report excessive heat, heat is clinically unsuitable, or pregnancy-related safety guidance excludes lower-abdominal heat application.

When urgent medical assessment takes priority

Urgent assessment is required for sudden or severe abdominal or pelvic pain; a rigid or guarded abdomen; collapse; persistent vomiting; vomiting blood; black or bloody stool; heavy vaginal bleeding; suspected ectopic pregnancy; fever with worsening abdominal pain; inability to pass urine; or signs of shock or sepsis. Persistent or worsening deep abdominal pain, shoulder-tip pain, faintness or unusual illness after needling also requires prompt medical evaluation.

Research note

CV6 is included in clinical acupuncture research involving fatigue, digestive, metabolic, postoperative and other presentations, usually as one point within a multi-point protocol. Such studies do not establish the independent effect of CV6, and findings from one condition, technique or population should not be generalised. Traditional functions and research evidence should be presented separately and without exaggerated claims.

Frequently asked questions

Where exactly is CV6 located?

CV6 is on the anterior midline of the lower abdomen, 1.5 B-cun below the centre of the umbilicus. It is a single midline point.

What does Qihai mean?

Qihai is commonly translated as “Sea of Qi”. The name reflects the point’s strong traditional association with supporting and regulating Qi.

Are CV6 and REN6 the same point?

Yes. CV6 and REN6 are two commonly used English abbreviations for the same point on the Conception Vessel, or Ren Mai.

How is CV6 distinguished from CV4?

CV6 is 1.5 B-cun below the umbilicus, while CV4 is farther inferior at 3 B-cun below the umbilicus. Both are on the anterior median line.

Can CV6 be needled during pregnancy?

Lower-abdominal acupuncture during pregnancy is not routine care. It requires specific obstetric acupuncture training, individual assessment, a clear rationale and compliance with recognised pregnancy-safety guidance. When pregnancy is possible but unconfirmed, treatment should be adapted conservatively.

Can patients use this guide for self-needling?

No. CV6 overlies the abdominal cavity and requires anatomical knowledge, pregnancy screening, sterile technique and professional assessment. This guide is intended only for qualified practitioners.

Continue exploring Project Lotus

Visit our Acupuncture Point Guides, read our ST36 Zusanli Guide, SP6 Sanyinjiao Guide or KD3 / KI3 Taixi Guide.

Practitioners can also browse our collection of professional acupuncture needles, compare our ORCA silver-handle needles with guide tube, or explore our Complete Moxa Guide and professional moxa range.

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Professional disclaimer: This article is provided for qualified acupuncture and healthcare practitioners for general educational purposes. Traditional actions and applications describe established acupuncture theory and are not claims of proven clinical efficacy. The content is not medical advice, does not replace accredited training and should not be used as a universal treatment protocol. Practitioners remain responsible for assessment, consent, safe technique, infection control, record keeping, referral and compliance with their professional and legal obligations.

Reference standards and safety reading:
World Health Organization. WHO Standard Acupuncture Point Locations in the Western Pacific Region.
World Health Organization. Guidelines on Basic Training and Safety in Acupuncture.
World Health Organization. WHO Benchmarks for the Practice of Acupuncture.
Huang CC, et al. Acupuncture: A Review of the Safety and Adverse Events and the Strategy of Potential Risk Prevention.
National Center for Complementary and Integrative Health. Acupuncture: Effectiveness and Safety.