About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Zhī Mǔ is a cooling, moistening herb used to bring down fevers, quench excessive thirst, and calm the body's internal heat. It is commonly found in formulas for high fevers, dry cough, hot flushes, night sweats, and conditions related to diabetes. Unlike many cold herbs that can be overly drying, Zhī Mǔ has a naturally moistening quality that helps protect the body's fluids.
Herb Category*
Main Actions*
- Clears Heat and Drains Fire
- Nourishes Yin and Moistens Dryness
- Generates Fluids and Relieves Thirst
- Clears Lung Heat
- Drains Kidney Fire
- Clears Stomach Heat
How These Actions Work*
'Clears Heat and drains Fire' refers to Zhī Mǔ's ability to directly reduce excess Heat in the body, particularly in the Lungs and Stomach. In practice, this means it is used when someone has a high fever with strong thirst, sweating, and a forceful pulse. It is a key herb for Qi-level Heat in febrile illnesses, where it works alongside Shí Gāo (gypsum) in the classic Bái Hǔ Tāng (White Tiger Decoction).
'Nourishes Yin and moistens Dryness' describes how Zhī Mǔ, despite being a cold herb, has a moist rather than drying quality. This is unusual among bitter cold herbs and makes it valuable for conditions where Heat has damaged the body's fluids and Yin. It can address dry cough from Lung dryness, or the tidal fevers, night sweats, and bone-steaming heat that come from Yin Deficiency with Fire flaring upward.
'Generates fluids and relieves thirst' relates to its use in conditions like diabetes (known in TCM as 'wasting-thirst,' xiāo kě), where internal Heat burns up body fluids, causing excessive thirst and frequent urination. Zhī Mǔ helps by clearing the Heat and supporting fluid production, though it is generally combined with other Yin-nourishing herbs for best results.
'Clears Lung Heat' means it targets Heat in the upper body, relieving cough with thick yellow sputum. 'Drains Kidney Fire' refers to its ability, especially in the salt-processed form, to address the deficiency fire of the Kidneys that produces hot flushes, night sweats, and low back pain. 'Clears Stomach Heat' addresses conditions like intense thirst, gum inflammation, and strong appetite with weight loss.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Zhi Mu 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 Zhi Mu addresses this pattern
Zhī Mǔ is bitter and cold, entering both the Lung and Stomach channels, making it ideally suited for clearing excess Heat from these two organs simultaneously. In Lung and Stomach Heat (often seen as 'Qi-level Heat' in febrile disease theory), pathogenic Heat blazes in the Yáng Míng, producing high fever, profuse sweating, strong thirst, and a forceful pulse. Zhī Mǔ's cold nature directly opposes this Heat, while its moistening quality protects the fluids that Heat is consuming. It is the defining Deputy herb in Bái Hǔ Tāng, where it assists Shí Gāo in clearing Qi-level Heat while adding a fluid-preserving action that Shí Gāo alone cannot provide.
A practitioner would look for one or more of these signs
High fever with strong thirst and sweating
Intense thirst with desire for cold drinks
Dry mouth and lips from Heat consuming fluids
Restlessness and irritability from internal Heat
Why Zhi Mu addresses this pattern
When Kidney and Liver Yin become depleted, deficiency Fire flares upward, producing tidal fevers, night sweats, and a sensation of heat rising from the bones. Zhī Mǔ addresses this pattern through its dual ability to clear deficiency Heat and moisten Yin. Its entry into the Kidney channel allows it to directly target the source of deficiency Fire, while its sweet, moistening quality gently nourishes depleted Yin. In this pattern, Zhī Mǔ is classically paired with Huáng Bǎi (Phellodendron bark), their combined action described as 'mutually reinforcing' (xiāng xū). The salt-processed form (Yán Zhī Mǔ) is preferred here, as salt guides the herb's action downward into the Kidneys.
A practitioner would look for one or more of these signs
Night sweats from Yin Deficiency Heat
Tidal fever and bone-steaming heat
Nocturnal emissions from deficiency Fire disturbing the lower body
Irritability and restlessness, worse in the afternoon or evening
Why Zhi Mu addresses this pattern
When Lung Yin is insufficient, the Lungs lose their natural moisture and the descending function of the Lung is impaired, leading to dry cough, scanty sticky sputum, and a dry throat. Zhī Mǔ enters the Lung channel and has a naturally moistening (zhì rùn) quality that distinguishes it from most bitter cold herbs. It clears residual Lung Heat while simultaneously moistening the airways, making it well suited for the combination of dryness and lingering Heat seen in Lung Yin Deficiency. It is classically combined with Chuān Bèi Mǔ (Fritillaria) in the Èr Mǔ Sǎn pairing to clear Lung Heat and resolve phlegm.
A practitioner would look for one or more of these signs
Dry cough with little or sticky sputum
Dry, scratchy throat
Chronic cough from Lung dryness
Why Zhi Mu addresses this pattern
Intense Stomach Heat can consume body fluids, producing wasting-thirst (xiāo kě), the TCM category that overlaps significantly with diabetes. Zhī Mǔ enters the Stomach channel and clears Stomach Fire while its moistening nature helps replenish the damaged fluids. The Shén Nóng Běn Cǎo Jīng lists 'wasting-thirst with internal Heat' (xiāo kě rè zhōng) as one of its primary indications. In this application, Zhī Mǔ is typically combined with other fluid-generating herbs like Tiān Huā Fěn and Mài Dōng.
A practitioner would look for one or more of these signs
Constant thirst despite drinking large amounts
Frequent urination with large volume
Excessive hunger with weight loss
TCM Properties*
Cold
Bitter (苦 kǔ), Sweet (甘 gān)
Rhizome (根茎 gēn jīng)
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.