About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Shuǐ Zhì (leech) is one of the most powerful Blood stasis-breaking substances in Chinese medicine, used when stubborn, long-standing Blood stagnation resists milder herbs. It is primarily used for conditions involving fixed abdominal masses, absent menstruation due to Blood clots, traumatic injuries with internal bruising, and the aftermath of stroke. Despite its strong action, classical texts note it breaks up old stagnant Blood without harming healthy new Blood.
Herb Category*
Main Actions*
- Breaks Blood and Dispels Stasis
- Promotes Menstruation
- Disperses Accumulations and Dissipates Nodules
How These Actions Work*
'Breaks Blood and expels stasis' means Shuǐ Zhì powerfully disperses old, stubborn Blood stagnation that has been stuck in the body for a long time. Unlike milder Blood-moving herbs such as Peach Kernel or Safflower, Shuǐ Zhì targets deeply lodged, hardened clots of stagnant Blood that resist gentler treatment. Its salty taste allows it to penetrate into the Blood level, while its bitter taste helps it push downward and break through blockages. Classically, this is expressed as 'salty enters the Blood, bitter purges stagnation' (咸入血走血，苦泄结). A key classical observation is that Shuǐ Zhì breaks up old stagnant Blood without damaging fresh, healthy Blood. This makes it especially valuable for long-standing Blood stasis conditions.
'Unblocks the channels and promotes menstruation' means it restores menstrual flow that has been blocked by Blood stasis. When stagnant Blood obstructs the uterine vessels and the Chōng and Rèn meridians, menstruation stops. Shuǐ Zhì's powerful stasis-breaking action clears these obstructions so that normal menstrual flow can resume. This is one of its most ancient recorded uses, dating back to the Shén Nóng Běn Cǎo Jīng.
'Disperses masses and accumulations' refers to its ability to break down fixed abdominal masses (癥瘕 zhēng jiǎ) caused by chronic Blood stasis. In TCM, when stagnant Blood accumulates over time, it can solidify into palpable lumps in the abdomen. Shuǐ Zhì, as an animal-derived substance with a natural affinity for blood, gradually penetrates and dissolves these hardened masses. It enters the Liver channel, which governs Blood storage and the smooth flow of Qi, making it particularly effective at addressing stasis in the Blood level of the Liver system.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Shui Zhi is traditionally associated with these specific patterns.
The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Shui Zhi addresses this pattern
Shuǐ Zhì directly targets the core pathomechanism of Blood Stasis. Its salty taste penetrates the Blood level and its bitter taste drives downward to break through obstructions. Entering the Liver channel (which governs Blood storage and smooth flow), it powerfully breaks up stagnant Blood that has become fixed and hardened. As a blood-feeding animal, it has what classical texts call a natural 'affinity' for stagnant Blood, seeking it out and dissolving it gradually without injuring fresh Blood. This makes it especially suited for severe or chronic Blood Stasis where lighter herbs like Peach Kernel or Safflower have been insufficient.
A practitioner would look for one or more of these signs
Menstrual absence due to Blood stasis obstruction
Fixed, stabbing lower abdominal pain that worsens with pressure
Dark clotted menstrual blood when flow does occur
Purple or dark tongue with stasis spots
Why Shui Zhi addresses this pattern
When Blood Stasis lodges in the chest, it can obstruct the Heart vessels and cause chest pain, or contribute to what modern medicine calls cardiovascular disease. Shuǐ Zhì's powerful stasis-breaking action can reach deep into the vessels to dissolve old clots. Its neutral temperature means it does not add Heat or Cold to a situation where the balance may already be disrupted. Modern clinical use frequently pairs Shuǐ Zhì with Qi-tonifying herbs like Huáng Qí for stroke recovery and cardiovascular conditions where Qi deficiency and Blood stasis coexist.
A practitioner would look for one or more of these signs
Fixed, stabbing chest pain from Blood stasis
Post-stroke paralysis with Blood stasis obstruction of brain vessels
Numbness or paralysis of limbs from obstructed circulation
Why Shui Zhi addresses this pattern
Traumatic injuries cause Blood to leave the vessels and pool in the tissues, forming localised stasis. Shuǐ Zhì breaks up this extravasated Blood and allows the body to reabsorb it. Its stasis-dissolving action is particularly strong for internal injuries where bruising and swelling are deep-seated. In classical usage, it was combined with Dà Huáng (rhubarb) to simultaneously purge stagnant Blood downward through the bowels, providing relief from severe traumatic pain.
A practitioner would look for one or more of these signs
Deep bruising from falls or blows
Swelling and pain at injury site that does not resolve
Severe internal pain after trauma with dark stool
TCM Properties*
Neutral
Salty (咸 xián), Bitter (苦 kǔ)
Animal — whole (全虫 quán chóng)
This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.