About This Formula
Traditional Chinese Medicine background and properties
Formula Description
A foundational formula for strengthening the digestive system and lifting the body's Qi when it has sunk or become depleted. It is commonly used for persistent fatigue, poor appetite, loose stools, and conditions involving organ prolapse (such as rectal or uterine prolapse) caused by weakness of the Spleen and Stomach. It is one of the most widely used formulas in all of Chinese medicine.
Formula Category
Main Actions
- Tonifies the Middle and Augments Qi
- Raises sunken Yang
- Lifts Sunken Qi
- Strengthens the Spleen
- Clears Heat from deficiency (sweet-warm method)
TCM Patterns
In TCM, symptoms don't appear randomly — they cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Bu Zhong Yi Qi Tang is traditionally associated with these specific patterns.
The following describes this formula's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Bu Zhong Yi Qi Tang addresses this pattern
Spleen Qi deficiency is the foundational pattern this formula addresses. When the Spleen is too weak to properly transport and transform food and fluids, the result is poor appetite, fatigue, loose stools, and a sallow complexion. The Spleen is the source of Qi and Blood for the entire body. Bu Zhong Yi Qi Tang directly targets this deficiency through its core group of Huang Qi, Ren Shen, Bai Zhu, and Zhi Gan Cao, which together powerfully restore the Spleen's function. Dang Gui supports Blood production that has faltered due to the weak Spleen, while Chen Pi ensures that the tonifying herbs do not overwhelm the already sluggish digestive system.
A practitioner would look for one or more of these signs
Persistent tiredness worsened by exertion
Reduced desire to eat, especially for heavy foods
Unformed or soft stools, not necessarily frequent
Shortness of breath and reluctance to speak
Sweating without exertion or heat exposure
Why Bu Zhong Yi Qi Tang addresses this pattern
This pattern develops when Spleen Qi deficiency progresses to the point where the Spleen can no longer maintain its upward-lifting function. The body's Qi literally 'sinks,' leading to organ prolapse (rectum, uterus, stomach), chronic diarrhea, and a sensation of heaviness or bearing-down in the abdomen. This is the pattern that most distinguishes Bu Zhong Yi Qi Tang from other Qi-tonifying formulas. The small doses of Sheng Ma and Chai Hu are specifically included to raise this sunken Qi. Paired with the powerful Qi-tonifying core of Huang Qi, Ren Shen, Bai Zhu, and Zhi Gan Cao, they lift the prolapsed organs and restore the Spleen's natural ascending movement.
A practitioner would look for one or more of these signs
Prolapse of the rectum, especially after defecation
Sensation of bearing-down or actual descent of the uterus
Long-standing diarrhea that does not resolve
Dizziness and blurred vision from clear Yang not reaching the head
Sensation of heaviness and dragging in the stomach area
Why Bu Zhong Yi Qi Tang addresses this pattern
This is the original pattern Li Dongyuan created the formula to treat. When Spleen Qi is depleted through overwork, irregular eating, or emotional strain, the clear Yang sinks into the lower body and becomes trapped, generating a low-grade, lingering fever. This is not true Heat from an external pathogen. It is what TCM calls 'Yin Fire' (阴火), an internal Heat that arises from deficiency rather than excess. The fever tends to come and go, worsen with fatigue, and is accompanied by spontaneous sweating and a desire for warm drinks. The formula's approach of using sweet, warm herbs to replenish Qi (rather than cold, bitter herbs to directly clear Heat) is the essence of the classical 'sweet-warm method to eliminate Heat' (甘温除热法). As the Qi is restored and the Yang raised back to its proper position, the trapped Heat dissipates naturally.
A practitioner would look for one or more of these signs
Intermittent low fever that worsens with fatigue
Sweating without obvious cause
Pronounced exhaustion and lack of vitality
Thirst with a preference for warm rather than cold drinks
How It Addresses the Root Cause
Bu Zhong Yi Qi Tang addresses a condition where the Spleen and Stomach have been weakened by overwork, irregular eating, emotional strain, or prolonged illness. The Spleen and Stomach are the body's central "digestive engine" and the source of Qi and Blood production. When they become depleted, the body cannot extract and distribute nourishment from food properly. This leads to reduced appetite, loose stools, fatigue, a pale complexion, and a general sense of heaviness and weakness.
The Spleen also has a crucial "lifting" function in TCM: it holds organs in place and sends refined nutrients upward to the Lungs and Heart. When Spleen Qi becomes too weak to perform this upward support, a condition called "sinking of middle Qi" (中气下陷) develops. This manifests as organ prolapse (rectal prolapse, uterine prolapse, stomach prolapse), chronic diarrhea, and abnormal uterine bleeding. Additionally, when clear Yang sinks to the lower body and becomes trapped, it generates a distinctive low-grade fever. This fever is not caused by an external infection or by true excess Heat; rather, it arises from the failure of Qi to circulate properly. Because the skin's protective barrier (the Wei Qi) is also weakened, spontaneous sweating is common.
Li Dongyuan recognized that treating this fever with cold, bitter herbs (the standard approach for clearing Heat) would only further damage the already fragile Spleen and Stomach. Instead, his breakthrough insight was to use sweet, warm herbs to restore the middle, lift the sunken Yang, and thereby resolve the fever at its root: a strategy known as "clearing Heat with sweet warmth" (甘温除热).
Formula Properties
Slightly Warm
Predominantly sweet with mild bitter and pungent notes — sweet to tonify the Spleen and generate Qi, mildly pungent to move and raise Qi, and slightly bitter to promote drainage and prevent stagnation.
Formula Origin
This is just partial information on the formula's TCM properties. More detailed information is available on the formula's dedicated page
