BL23 (Kidney Shu) vs GV4 (Ming Men) — Which Acupoint Should You Press?

What’s the difference between Shenshu and Mingmen?

For those new to traditional Chinese medicine, Shenshu (BL23) and Mingmen (GV4) are often confused. Both are located below the spinous process of the second lumbar vertebra, and both help with lower back pain and fatigue. However, even though the exact location difference seems small, when the direction of stimulation and depth of penetration differ, the nature of the stimulus the body receives becomes entirely different. Shenshu is an acupoint that regulates qi and blood flowing outward laterally, while Mingmen is an acupoint that restores original qi flowing through the central axis. Depending on symptoms and constitution, which point is stimulated first significantly affects treatment results.

Understanding Shenshu (BL23) in Depth

Exact Location

Shenshu is located at the height below the spinous process of the second lumbar vertebra, approximately 1.5 cun (about 4.5 cm) laterally from the midline of the spine. In other words, it exists as a pair on both sides of the spine. When you palpate the muscle beside the spine with your finger, there is a slightly depressed point—that is the location. Shenshu is located on the meridian called the Bladder meridian (BL), and is a “shu” point that directly stimulates the kidneys. The important point is that Shenshu has lateral distance from the spinous process—this means that stimulation of Shenshu focuses more on the surrounding muscles and kidney function rather than the spine itself.

Recommended for These Conditions

Chronic lower back pain, especially pain extending to the lateral side: Since Shenshu strengthens kidney qi, it is excellent for symptoms where the lateral lower back feels tight from standing or sitting for long periods. When fatigue and weakness are severe: Stimulating Shenshu has the effect of replenishing kidney essence (jing), making it ideal for those who wake up in the morning with unrelieved fatigue. Tinnitus (ringing in the ears): The relationship between the kidneys and ears is very close in traditional Chinese medicine, so stimulating Shenshu is effective for stress-related tinnitus. Reproductive health: Shenshu is also connected to the reproductive organs, so it is used for improving infertility and irregular menstruation. Reducing edema: Since Shenshu regulates fluid metabolism, it is especially recommended for those with lower body swelling.

Acupressure Method and Tips

Correct posture: You can do this standing or lying down, but the easiest method is to place your hands on your lower back and locate Shenshu with your thumbs. Pressure adjustment: For Shenshu, a “slow lifting motion” is more effective than “firm pressure.” Slowly press over 3 seconds, then slowly release over 3 seconds. Repeat this 10 times over 3 minutes. Important caution: Although Shenshu is near the spine, you must not press the spine itself. The key is to stimulate the muscle tissue beside the spine. Warming effect: Shenshu loves warmth, so stimulating it with warm fingers or applying mugwort moxibustion is even more effective. Optimal time: Stimulating at 5:00 AM to 7:00 AM (the Kidney hour in traditional Chinese medicine), when kidney qi is most abundant, is most effective.

Understanding Mingmen (GV4) in Depth

Exact Location

Mingmen is located much more centrally than Shenshu. It is located directly in the depression between the spinous processes (the indented area between the spinous processes) below the second lumbar vertebra, on the Governing Vessel (GV), which is contrasted with the Conception Vessel. The key difference from Shenshu is that it is positioned exactly on the midline of the spine. The character “ming” (命) in Mingmen means “life” or “fundamental,” reflecting the philosophy that this acupoint deals with the “source” of life energy. Since it is located deeper and more centrally than Shenshu, the stimulation method must also be more careful.

Recommended for These Conditions

Acute lower back pain, especially a “twisting” sensation: Since Mingmen addresses the central axis energy of the spine, it shows rapid effects for acute pain from strains. Unexplained fatigue and lethargy: While Shenshu replenishes “kidney essence,” Mingmen restores “original qi” itself. This is for when you feel tired or unmotivated without any particular reason. Decreased digestive function and diarrhea: While Shenshu has no diarrhea benefit, Mingmen restores abdominal central axis yang qi and is effective for improving diarrhea. Knee pain: In traditional Chinese medicine, it is believed that “the lower back is the source,” so restoring original qi through Mingmen delivers energy to the knees, improving knee pain. Urinary difficulty, nocturia: Mingmen is an acupoint that aids the kidney’s transformative function and is effective for symptoms where urine does not flow easily or when waking frequently at night.

Acupressure Method and Tips

Correct posture: Since Mingmen is an acupoint on the midline of the spine, stimulating in a kneeling sitting position (seiza) is the safest and most effective. When lying down, place a cushion under the abdomen to prevent excessive compression of the spine. Pressure adjustment: Unlike Shenshu’s “lifting motion,” Mingmen uses “vertical pressing” as the basic technique. Place your thumb perpendicular to the spine and press slowly, aiming for a “pushing sensation” rather than a “stabbing sensation.” Press for 5 seconds and rest for 5 seconds, repeating 5 times. Depth adjustment: Since Mingmen is located deeper than Shenshu, the stimulation should penetrate through the muscle layer to the area around the spine. However, be careful not to damage the spine itself. Start with light pressure initially and gradually increase intensity as you adapt. Heat therapy: Mingmen also loves warmth, so placing a heat pack or applying mugwort moxibustion doubles the effectiveness. Optimal time: Stimulating Mingmen just before dawn (the Kidney hour, 5:00 AM to 7:00 AM) fills your body with energy throughout the day.

Key Comparison Summary

Synergistic Effects When Used Together

Stimulating both Shenshu and Mingmen together is called “Shenming (kidney-life) combined stimulation.” Combination guide by situation: (1) Chronic lower back pain + fatigue: Restoring kidney qi through Shenshu and strengthening central axis original qi through Mingmen together can provide 1.5 times faster recovery compared to stimulating Shenshu alone. The recommended stimulation order is “Mingmen first (align central axis), then Shenshu (bilateral reinforcement).” (2) Unexplained diarrhea + lower back pain: The diarrhea-improving effect of Mingmen and the kidney qi-strengthening benefit of Shenshu work together to simultaneously normalize intestinal motility and kidney fluid metabolism. (3) Chronic fatigue with knee pain: Simultaneous stimulation of Mingmen (knee pain) and Shenshu (kidney fatigue) improves qi and blood circulation throughout the leg, rapidly resolving knee pain. In actual acupuncture clinic practice, combined treatment is performed, such as applying moxibustion to both Shenshu and Mingmen together (heat moxibustion treatment) or placing herbal acupuncture simultaneously on both points. Precautions: When stimulating both Shenshu and Mingmen on the same day, space them out. It is safest to do Mingmen in the morning (deep stimulation) and Shenshu in the evening (light stimulation). Stimulating too strongly from the beginning may increase fatigue, so start with light intensity and gradually increase strength.

Conclusion: Situation-Based Selection Guide

Choose Shenshu first: (1) When you have lower back pain extending to the lateral side, (2) When your lower back feels stiff from standing for long periods, (3) When tinnitus accompanies the symptoms, (4) When you have lower body edema, (5) When a beginner is starting lower back self-care. Choose Mingmen first: (1) When you have acute lower back pain from a sudden strain, (2) When you feel tired without any apparent reason, (3) When you have diarrhea or constipation, (4) When your knees hurt while your lower back is weak, (5) When you have nocturia or urinary difficulty. When you need both: For chronic lower back pain and severe fatigue, using both Shenshu and Mingmen together can provide synergistic effects for faster recovery. However, strong stimulation from the start may actually increase fatigue, so the principle is to start with light intensity (about 30-40% of pain level) and increase strength after 2 weeks. If symptoms do not improve even after 6 or more weeks of stimulation, please consult a professional acupuncturist to identify the exact cause and receive personalized treatment.