PC8 (Laogong) acupuncture point: location, classical functions, and clinical applications

PC8 sits in the center of the palm, between the second and third metacarpal bones, closer to the third. Its classical name is Laogong, which translates as "Labor Palace." The pericardium in Chinese medicine functions as the heart's protector, managing the emotional and thermal burden the heart carries. PC8 is where that protective function is most directly accessed.

This is the Ying-Spring point on the Pericardium channel. In five-element theory, every acupuncture channel has five transport points assigned to the five elements: Jing-Well, Ying-Spring, Shu-Stream, Jing-River, and He-Sea. PC8 is the Fire point of the Pericardium, which is itself a Fire channel. That double-fire classification makes it the most concentrated intervention available on this channel for excess heat conditions.

How to locate PC8

The point is not on a major bony landmark, which makes locating it slightly more involved than most points. Several methods are used clinically:

• Make a loose fist and note where the tip of the middle finger touches the palm. PC8 is in that region, between the second and third metacarpals. Some classical sources reference the ring finger instead, placing the point slightly more ulnar.
• With the hand flat and relaxed, feel for the gap between the second and third metacarpal bones in the mid-palm. The point sits in the depression at the center of that space, roughly midway between the wrist crease and the finger web.
• The area is typically more tender to moderate pressure than surrounding tissue. This sensitivity is characteristic of Ying-Spring points in general.
• In patients with heat presentations, palpation sensitivity at PC8 is often noticeably higher than at adjacent points on the same hand.

Classical functions

PC8 has a narrower classical profile than many other pericardium points. It is not a general-purpose point. Its actions are concentrated around heat and the heart-mind relationship:

• Clears heat from the pericardium and heart, specifically excess or pathological heat rather than deficiency patterns.
• Calms the shen (mind and spirit), particularly in acute agitation, restlessness, and heat-driven mental disturbance.
• Resolves fire toxins that manifest in the mouth and tongue, including oral ulcers, sores, and painful swollen gums caused by upward-flaming heart fire.
• Clears heat from the palms, making it the primary point for conditions involving burning sensation or excessive sweating in the hands.
• Opens the orifices in febrile disease with loss of consciousness. Historically used alongside GV-26 and PC6 in emergency presentations.
• Stops vomiting when the cause is stomach heat rising through the pericardium channel pathway.

The point performs best in excess presentations. Patients whose heat arises from yin deficiency, or who present with mixed excess and deficiency, typically need supporting points alongside PC8 or a different primary point.

The double-fire classification

The Pericardium channel belongs to the Fire element. Each channel contains five transport points assigned to all five elements in sequence. PC8 is the Fire point within the Fire channel. In practice, this means it carries the strongest energetic signature for clearing and moving heat on the pericardium channel.

For comparison: PC9 (Zhongchong) is the Wood point, used to move stagnation and open orifices in acute conditions. PC7 (Daling) is the Earth and Source point, used for calming and grounding. PC6 (Neiguan) is the Metal and Luo-Connecting point, best known for nausea, cardiac regulation, and linking the pericardium to the triple burner. PC8 occupies a different niche from all of them. It runs hotter and narrower -- the clearest option when excess fire is the central pattern.

Neuroanatomy and mechanism

The palm is served primarily by the median nerve, which passes through the carpal tunnel and fans into the palmar digital branches in the mid-palm. PC8 lies in the territory of those palmar digital branches, directly over the common palmar digital nerves at a point where stimulation has access to the median nerve's palmar cutaneous branch.

Needling here activates a different segment of the median nerve than PC6 does. At PC6 (the wrist), the needle reaches the nerve trunk passing through the carpal tunnel. At PC8, it reaches the more distal palmar branches. Both points modulate the same channel and share some clinical indications, but PC8 produces a stronger localized deqi response and is better suited for conditions where the hands are the primary site, whether that is sweating, burning, or post-stroke motor impairment.

The cardiac and psychological effects of PC8 are thought to run through the median nerve's connection to the sympathetic chain via the thoracic spinal cord. Research published in Acupuncture in Medicine has documented increased parasympathetic tone following pericardium channel needling at palmar points, consistent with the classical use for palpitations and anxiety. The effect on heart rate variability appears to be measurable and dose-dependent over a course of treatment.

Clinical conditions that respond to PC8

PC8 appears across several distinct categories of clinical presentation. The common thread is excess heat, whether the expression is cardiovascular, dermatological, neurological, or oral:

• Palpitations with anxiety: the fast, fluttery, or irregular heartbeat that accompanies emotional stress or heat states. This is distinct from structural arrhythmia, which requires cardiological evaluation before acupuncture treatment is incorporated.
• Recurring mouth and tongue ulcers: canker sores, painful oral lesions, or persistent tongue redness without systemic infection, especially in patients who run warm or have disrupted sleep.

• Palmar hyperhidrosis: excessive hand sweating with a heat quality, worse with emotional triggers, at rest, or in warm environments.
• Post-stroke hand motor recovery: part of integrated needling protocols targeting fine motor function in the affected hand.
• Febrile illness with agitation: high-fever states accompanied by restlessness, delirium, or extreme emotional disturbance.
• Insomnia with a heat pattern: difficulty settling, feeling hot at night, tendency to kick off covers, circular racing thoughts that prevent sleep onset.
• Palmar eczema or contact dermatitis: when the presentation involves redness, burning quality, and itch with a clear heat component rather than a cold or dampness-predominant picture.

Stroke rehabilitation and hand motor recovery

One of the more researched modern applications is post-stroke hand motor recovery. Stroke-related hand impairment is common and often the most persistent motor deficit, partly because fine motor control requires coordination across more cortical territory than proximal limb movements.

Standard rehabilitation protocols rely on repetitive task training and constraint-induced movement therapy. These approaches are effective but can plateau, particularly when the initial motor deficit is severe. Acupuncture protocols for stroke rehabilitation typically combine scalp acupuncture over the motor cortex representation area with distal body points on the affected hand.

PC8, combined with LI4 (Hegu) and the Ba Xie extra points between the finger webs, is the standard hand protocol in this context. The logic is peripheral nerve stimulation of the hand running alongside central nervous system modulation via scalp points. A 2021 systematic review in the Journal of Stroke and Cerebrovascular Diseases pooled data from 14 trials and found combined scalp acupuncture plus body acupuncture produced greater improvements in Fugl-Meyer upper extremity scores than rehabilitation alone. PC8 appeared in 9 of the 14 point protocols reviewed. The effect sizes were moderate and the review flagged significant heterogeneity across studies, so the appropriate framing is adjunct treatment, not a replacement for occupational therapy.

Treatment timing affects outcomes meaningfully. The window for neuroplastic change is widest in the first 6 to 12 months after stroke. Patients who begin acupuncture in that window consistently show better motor outcomes than those who start later. That said, later-stage treatment still produces some measurable benefit, and patients more than a year post-stroke are not excluded.

Anxiety and palpitations

The pericardium channel in Chinese medicine is the primary channel for emotional experience that directly affects cardiac function. Anxiety with palpitations, panic attacks that produce a racing heart, and the physical sensation of the heart jumping under stress all fall within its clinical domain.

PC8 addresses acute presentations in this category, specifically when heat is the pattern. The characteristic picture is a patient who runs warm, sweats easily under emotional pressure, has a red face with stress, and experiences insomnia alongside the palpitations. For chronic or deficiency-based anxiety, PC6 and HT7 (Shenmen) are more commonly primary, and PC8 shifts to a supporting role or is omitted.

The autonomic mechanism is consistent with this use. Palmar stimulation reaches the sympatho-vagal balance through the thoracic spinal cord, and the clinical result in heat-pattern anxiety is a reduction in resting heart rate, improved heart rate variability, and a calming effect that patients often notice partway through the session. The response during needle retention tends to be faster at PC8 than at wrist-level points.

Palmar hyperhidrosis

Excessive palm sweating is a condition conventional medicine manages through topical agents, iontophoresis, Botox injections, or endoscopic thoracic sympathectomy. Each has significant drawbacks. Botox requires repetition every 6 months or less. Sympathectomy is effective but permanent, and compensatory sweating on the trunk or feet develops in a substantial portion of patients.

Palmar sweating is controlled by the sympathetic nervous system through a neural pathway running through the thoracic sympathetic ganglia at T2 to T4. PC8 stimulates the median nerve in territory that has segmental connections to this chain. The point is used alongside HT6 (Yinxi) for the deficiency heat and spontaneous sweating pattern, and SP6 (Sanyinjiao) when a systemic yin deficiency component is present.

Clinical response in this application tends to be partial rather than complete. The more realistic outcome is a reduction in severity and trigger sensitivity rather than elimination of the sweating. That is often enough. Patients whose hand sweating prevents a normal handshake, creates problems with writing, or disrupts work requiring grip on tools often report meaningful quality of life improvement at that level of response.

Needling technique

PC8 is one of the more sensitive body points to needle. The palm has a high density of mechanoreceptors and free nerve endings, and the deqi response is nearly universal and often strong. The approach is different from most body points:

• Gauge: use a thinner needle than standard body points. 0.16 mm or 0.18 mm is appropriate. Avoid 0.25 mm at this location.
• Depth: shallow, 0.3 to 0.5 cun perpendicular. The palm does not permit deep needling, and depth beyond 0.5 cun is unnecessary and risks periosteum contact with the metacarpal.
• Direction: perpendicular, or very slightly oblique toward the wrist. Some practitioners angle the needle gently toward PC6 to establish channel continuity distally.
• Stimulation: minimal. The point responds strongly to light stimulation. Heavy manipulation is counterproductive and increases patient discomfort without improving the therapeutic response.
• Moxa: direct moxa is contraindicated here due to nerve density and the risk of burns. Indirect warming moxa (stick moxa held at a safe distance) is used for deficiency presentations, though the more common indications for PC8 involve excess heat, which contraindicates moxa altogether.
• Retention time: 20 to 30 minutes. The deqi sensation typically shifts from sharp and intense in the first few minutes to a diffuse, warm spreading quality that most patients find pleasant. Patients with strong sensitivity can be told to expect the initial sharpness and reassured it settles quickly.

Common point combinations

PC8 is rarely used in isolation. Effective combinations are organized around the presenting pattern:

• Mouth ulcers and heart fire: PC8 + HT8 (Shaofu) + CV-14 (Juque). HT8 is the Fire point of the Heart channel, making this combination address the same excess fire pattern from both the heart and pericardium sides.
• Palpitations with anxiety: PC8 + PC6 (Neiguan) + HT7 (Shenmen). PC6 regulates the pericardium at the wrist and calms the middle burner; HT7 directly calms the heart spirit.
• Palm sweating: PC8 + HT6 (Yinxi) + SP6 (Sanyinjiao). HT6 is the Xi-Cleft point of the heart channel and specifically addresses spontaneous and deficiency sweating. SP6 supports yin broadly.
• Post-stroke hand rehabilitation: PC8 + LI4 (Hegu) + Ba Xie (extra points at finger webs) + scalp acupuncture over the motor line. This is the standard integrated hand protocol in neurological acupuncture.
• Febrile agitation and orifice opening: PC8 + GV-26 (Renzhong) + PC6 (Neiguan). GV-26 opens the mind in acute high-fever states; PC6 stabilizes the pericardium and reduces nausea.
• Insomnia with heat pattern: PC8 + HT7 (Shenmen) + KD-1 (Yongquan). KD-1 draws heat downward from the upper burner, creating a descending vector that PC8 alone cannot produce. This combination works better for patients with heat rising at night than a purely calming protocol.
• Palmar eczema with heat: PC8 + LI11 (Quchi) + SP10 (Xuehai). LI11 and SP10 clear heat and move blood; PC8 addresses the channel-specific heat component in the palm.

What to expect from treatment

The deqi response at PC8 is strong and typically immediate. Most patients describe a spreading warmth, pressure, or distension in the palm, sometimes extending toward the wrist or up the forearm along the pericardium channel. This is expected and indicates median nerve pathway activation. The intensity softens over the first few minutes of retention and usually transitions into a more diffuse warmth.

For acute heat presentations such as mouth ulcers or acute palpitations, one to three sessions often produces a clear response. The oral ulcers resolve faster than they normally would, or the palpitation episode subsides during the session itself.

Chronic conditions need a longer course. Recurring oral ulcers, established palmar hyperhidrosis, and chronic anxiety with heat features typically require 8 to 12 sessions for durable improvement. The first signs of response are usually a reduction in frequency or intensity before the condition resolves.

Stroke hand rehabilitation has its own timeline. Early-stage patients within 3 months of stroke often show rapid initial gains in the first 10 to 15 sessions, followed by a period of slower consolidation. Treatment typically continues weekly for 3 months and then shifts to maintenance or as-needed frequency depending on plateau.

Getting started

We accept Aetna, Blue Shield of California, Cigna, UnitedHealthcare, Kaiser Permanente, and Medi-Cal at our West LA, Hawthorne, and Lynwood locations. Most commercial plans cover acupuncture for neurological, cardiovascular, and chronic pain conditions. Workers' compensation cases are accepted for work-related conditions including repetitive strain and post-injury neurological deficits. Patients receiving care for motor vehicle accident injuries can be treated on a personal injury lien with no upfront payment.

Book online at natureac.janeapp.com or call (424) 317-0014. Clinics at 11901 Santa Monica Blvd STE 209 (West LA), 11633 Hawthorne Blvd STE 402 (Hawthorne), and 3680 E Imperial Hwy STE 460 (Lynwood).