Patterns Addressed
In TCM, symptoms don't appear randomly — they cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. An Chong Tang is designed to correct these specific patterns.
Why An Chong Tang addresses this pattern
Spleen Qi deficiency is the root mechanism of this formula's primary indication. When the Spleen is too weak to govern Blood, the Chong vessel loses its stability and Blood escapes downward through the uterus. An Chong Tang's King herbs (Huang Qi and Bai Zhu) directly restore Spleen Qi, while the astringent mineral substances (Long Gu, Mu Li, Hai Piao Shao) physically reinforce the Chong vessel's containment. The Deputy herbs (Sheng Di, Bai Shao, Xu Duan) address the secondary damage from chronic Blood loss. This formula is particularly suited when the Spleen deficiency has led to prolonged, moderate uterine bleeding rather than acute flooding.
A practitioner would look for one or more of these signs
Excessive menstrual flow, pale and thin in quality
Generalized tiredness from Qi and Blood depletion
Wan white or sallow face reflecting Qi and Blood deficiency
Reduced appetite from weak Spleen function
Why An Chong Tang addresses this pattern
This pattern is the direct manifestation of Spleen Qi deficiency in the context of bleeding. The Spleen's function of 'controlling Blood' (统血) means keeping it within the vessels. When this function fails, Blood leaks out, and in the context of the Chong vessel, this manifests as prolonged menstruation or intermenstrual spotting. An Chong Tang specifically targets this pattern by combining Qi-tonifying herbs to restore the Spleen's holding force with heavy astringent substances to physically secure the Chong vessel. The formula is designed for the chronic "leaking" (漏) presentation rather than acute heavy "flooding" (崩).
A practitioner would look for one or more of these signs
Continuous light bleeding or spotting between periods
Periods that go on too long or are excessively heavy
Loose stools indicating underlying Spleen weakness
Why An Chong Tang addresses this pattern
When Qi is insufficient, it cannot hold Blood within the vessels. This broader pattern encompasses not only Spleen Qi deficiency but also the general weakening of the body's Qi that follows prolonged bleeding. An Chong Tang addresses this through its large doses of Huang Qi and Bai Zhu, which powerfully rebuild Qi, while the astringent herbs provide immediate support for the weakened containment mechanism. The Yin-nourishing Deputies (Sheng Di, Bai Shao) also help by preventing further depletion of the body's substance.
A practitioner would look for one or more of these signs
Menstrual bleeding that is pale, dilute, and profuse
Shortness of breath or weak voice from Qi depletion
Dizziness from combined Qi and Blood deficiency
Commonly Prescribed For
These conditions can arise from the patterns above. A practitioner would consider An Chong Tang when these conditions are specifically caused by those patterns — not for all cases of these conditions.
TCM Interpretation
In TCM, heavy menstrual bleeding (崩漏, beng lou) is primarily understood through the lens of the Chong vessel and the organs that govern it. The Chong vessel is sometimes called the "sea of Blood" and directly controls menstrual flow. The Spleen, Liver, and Kidneys all play roles in maintaining the Chong vessel's stability. When Spleen Qi is deficient, its ability to "govern Blood" weakens, and the Chong vessel becomes insecure, leading to Blood escaping downward. Prolonged bleeding then depletes Yin and Blood further, creating a self-perpetuating cycle of deficiency and leakage.
Why An Chong Tang Helps
An Chong Tang directly addresses the Spleen Qi deficiency at the root of the condition. Huang Qi and Bai Zhu restore the Spleen's ability to hold Blood in its vessels, while Long Gu, Mu Li, and Hai Piao Shao physically astringe the Chong vessel to stop active bleeding. Sheng Di and Bai Shao replenish the Yin and Blood that have been lost through chronic excessive menstruation. Crucially, Qian Cao prevents the astringent herbs from causing Blood stasis, ensuring that old Blood is cleared even as the bleeding is controlled. This formula is best suited for the chronic, moderate bleeding pattern (漏, lou) rather than acute heavy flooding.
TCM Interpretation
Dysfunctional uterine bleeding (DUB) without a clear structural cause is understood in TCM as a disruption of the Chong and Ren vessels, most often rooted in deficiency of the Spleen, Kidneys, or both. The Spleen fails to hold Blood within the vessels, while the Kidneys may fail to secure the foundation of the Chong vessel. In perimenopausal women, a combination of Kidney decline and Spleen Qi exhaustion is common, explaining why DUB frequently occurs during this life transition.
Why An Chong Tang Helps
An Chong Tang targets the Spleen Qi deficiency and Chong vessel instability that underlie many cases of DUB. The formula's combination of Qi-tonifying herbs (Huang Qi, Bai Zhu), Kidney-supporting Xu Duan, Blood-nourishing Sheng Di and Bai Shao, and astringent minerals (Long Gu, Mu Li, Hai Piao Shao) addresses both the root deficiency and the active bleeding. Modern research has shown that this formula may promote endometrial repair and influence estrogen and progesterone receptor expression, providing a potential mechanism for its clinical effectiveness in DUB.
Also commonly used for
Stops prolonged postpartum bleeding from Qi deficiency
Secures the Chong vessel to stop intermenstrual spotting
What This Formula Does
Every TCM formula has a specific set of actions — here's what An Chong Tang does in the body, explained in both everyday and TCM terms
Therapeutic focus
In practical terms, An Chong Tang is primarily used to support these areas of health:
TCM Actions
In TCM terminology, these are the specific therapeutic actions that An Chong Tang performs to restore balance in the body:
How It Addresses the Root Cause
TCM doesn't just suppress symptoms — it aims to resolve the underlying imbalance. Here's how An Chong Tang works at the root level.
This formula addresses a pattern in which the Spleen's Qi is too weak to perform one of its essential jobs: holding Blood within the vessels. In TCM, the Spleen is responsible for "governing the Blood," meaning it generates the force that keeps Blood circulating in its proper channels rather than leaking out. When Spleen Qi becomes deficient, this holding power weakens, and the Chong vessel (one of the body's extraordinary vessels that governs the uterus and menstrual blood) loses its stability.
The result is chronic or prolonged uterine bleeding: periods that are excessively heavy, that drag on well past their normal duration, or that appear as continuous spotting between cycles. Because the bleeding has persisted, Yin and Blood are also gradually depleted, creating a vicious cycle where the body's nourishing substances drain away, further weakening the Qi. The blood that comes out is typically pale and thin in quality, reflecting the underlying deficiency rather than Heat driving it out of the vessels.
Zhang Xichun designed this formula to break this cycle by simultaneously restoring the Spleen's ability to contain Blood (treating the root), astringing the Chong vessel to physically stop the leakage (managing the symptom), and nourishing the Yin and Blood that have already been lost (repairing the damage).
Formula Properties
Every formula has an inherent temperature, taste, and affinity for specific organs — these properties determine how it interacts with the body
Overall Temperature
Taste Profile
Predominantly sweet, bitter, and astringent — sweet to tonify Qi and nourish Blood, bitter to cool and clear mild Heat, astringent to secure the Chong vessel and stop bleeding.
