The back doorway to the Triple Burner. Sanjiaoshu (BL-22) regulates the body's three great metabolic chambers — upper, middle and lower — moves fluids, clears Dampness, and restores smooth Qi transformation throughout the entire trunk.
Name & story
The name 三焦俞 Sanjiaoshu means "Triple Burner Shu" — the Back-Shu point of the Sanjiao, the Triple Burner. "Shu" here means a place where the Qi of an organ is infused into the back, like a well opening to the surface. The Triple Burner (Sanjiao) is one of the most fascinating concepts in all of Chinese medicine: not a single organ but a system of three interconnected zones — the Upper Burner (chest, Heart and Lungs), the Middle Burner (digestive centre, Spleen and Stomach), and the Lower Burner (below the navel, Kidneys and Bladder). Together they govern the movement of fluids and the transformation of Qi throughout the body. This point is the master switch for all three of them at once.
Point family & character
Sanjiaoshu BL-22 belongs to the Bladder Meridian (BL). Its most important character is that it is the Back-Shu point of the Triple Burner (Sanjiao) — the place on the back where the Qi of the Sanjiao gathers and can be directly accessed. Because the Sanjiao channel belongs to the shaoyang system, this point also carries shaoyang qualities and is used for classic shaoyang-pattern signs such as alternating chills and fever.
Five-element dynamics
The Triple Burner in Chinese medicine is the great coordinator of fluid metabolism and Qi transformation. When the three Burners are working harmoniously, food becomes nourishment, water flows freely and warmth is distributed evenly. When they are disrupted — by Cold, Dampness, stagnation or weakness — fluid accumulates, digestion falters and the body feels blocked and heavy. Sanjiaoshu BL-22 acts like a regulator valve for the whole system, opening what is stuck and restoring the smooth transformation of fluids and Qi from top to bottom.
Location
On the back, 1.5 Cun lateral to the lower border of the spinous process of the first lumbar vertebra (L1). It sits just above Shenshu BL-23 (which is at L2) and just below Weishu BL-21 (at T12), along the inner Bladder line of the back.
Anatomy & fascia
The point lies in the region of the lumbar musculature, approximately at the level of the first lumbar vertebra (L1).
Needling
The needle is inserted perpendicularly or at a slight oblique angle.
Safe depth
0.5–1 Cun, depending on the build of the patient.
Moxa, cupping & Tui Na
Moxa is very appropriate at this point, particularly when the condition involves Cold or Dampness in the middle and lower body — warming Moxa helps the Sanjiao to transform and move fluids. Cupping is also commonly applied over the back-Shu region, especially for Qi Stagnation and Dampness. Gentle massage along the inner Bladder line can support the treatment between sessions.
Functions
Regulates the Triple Burner (Sanjiao) and promotes Qi transformation. Resolves Dampness and moves fluid metabolism throughout the three Burners. Strengthens the Middle Burner and supports digestion. Regulates the water passages and supports the Bladder's Qi transformation function. Addresses shaoyang-pattern disorders: alternating chills and fever, Heat in the body, bitter taste in the mouth, headache and visual dizziness.
Indications
Digestive complaints rooted in Dampness or stagnation: borborygmus (rumbling in the belly), abdominal distention, watery diarrhoea, undigested food in the stool, poor appetite, nausea. Epigastric masses or fullness — hypogastric masses that are hard and big, with epigastric distention and undigested food. Fluid metabolism disorders: oedema, difficult urination, fluid accumulation. Shaoyang-pattern symptoms: alternating chills and fever, Heat in the body, bitter taste in the mouth, headache, visual dizziness. Lower back stiffness and pain in the lumbar region.
Mind & spirit (Shen)
The Sanjiao is said to govern the "three cavities" of the body — and when its Qi is stuck or overwhelmed, a person can feel foggy, congested and emotionally heavy, as though everything is clogged and nothing flows. By restoring the smooth movement of Qi and fluids through all three Burners, Sanjiaoshu BL-22 helps lift that heavy, stagnant feeling — both physically and mentally. When the body's metabolism flows freely again, the mind tends to feel clearer and lighter too.
Point combinations
With Xiaochangshu BL-27, Xialiao BL-34, Yishe BL-49 and Zhangmen LIV-13 — for borborygmus, abdominal distention and watery diarrhoea (Thousand Ducat Formulas). With Dachangshu BL-25, Taibai SP-3 and Gongsun SP-4 — for borborygmus (Supplementing Life). With Zusanli ST-36, Dachangshu BL-25, Sanyinjiao SP-6, Xiawan REN-10, Xuanshu DU-5 and Liangmen ST-21 — for undigested food in the stool (Supplementing Life). With Zhongwan REN-12 — for hypogastric masses that are hard and big, with epigastric distention and undigested food (Thousand Ducat Formulas).
Clinical spotlight
What makes Sanjiaoshu BL-22 genuinely distinctive is its reach: as the Back-Shu of the Triple Burner, it is one of the few points that can influence Qi transformation and fluid metabolism simultaneously across all three zones of the body. Deadman notes its usefulness not only for digestive and fluid disorders but also for classic shaoyang-pattern presentations — alternating chills and fever, bitter taste, headache — even though it sits on the Bladder Meridian (BL) rather than on the Sanjiao channel itself. This dual role, metabolic regulator and shaoyang point, gives it an unusually wide clinical reach among the back-Shu points.
The golden tip
For those with a tendency toward fluid retention, bloating, heavy legs or sluggish digestion, the back-Shu points — including BL-22 — respond well to gentle warmth. Placing a warm heat pack over the lumbar region (covering BL-22 and its neighbours) for 10–15 minutes can help ease that heavy, congested feeling. Light self-massage along both sides of the lower spine, pressing gently with the thumbs, is another simple way to stimulate this area. Always keep the lower back warm in cold or damp weather.
For education only — not medical advice. Consult a qualified practitioner.