About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Sweet wormwood is a cold, bitter herb best known for clearing lingering, low-grade fevers and the sensation of deep internal heat, especially the kind that worsens at night. It is also the plant from which the Nobel Prize-winning antimalarial compound artemisinin was discovered. In TCM, it is most commonly used for people recovering from prolonged illness who still have residual heat, as well as for summer-heat illness and malarial fevers.
Herb Category*
Main Actions*
- Clears Deficiency Heat
- Cools the Blood and eliminates steaming bone disorder
- Clears Summer-Heat
- Checks Malaria
- Clears Liver and Gallbladder Heat
- Clears Damp-Heat and Resolves Jaundice
How These Actions Work*
'Clears deficiency heat' means Qīng Hāo can address low-grade, lingering fevers that come from a depletion of the body's Yin (its cooling, moistening aspect). This is the herb's signature strength. Unlike herbs that fight acute, raging fevers, Qīng Hāo specializes in the smoldering, difficult-to-clear heat that persists after a severe illness or in people with chronic Yin Deficiency. It is particularly suited for the classic pattern of 'night fever with early morning coolness,' where heat flares at night and subsides by dawn without any sweating.
'Cools the Blood and eliminates steaming bone disorder' refers to its ability to clear deep-seated heat lodged in the Yin level and blood. 'Steaming bone' (骨蒸 gǔ zhēng) is a TCM term for a sensation of heat radiating outward from deep within the bones, often accompanied by afternoon or evening fevers, night sweats, flushed cheeks, and progressive weight loss. Because Qīng Hāo enters the Liver channel and reaches the blood level, it can access and clear this deeply lodged heat in a way that many surface-level heat-clearing herbs cannot.
'Resolves summer-heat' means this herb is effective for illnesses caused by exposure to summer heat and humidity, with symptoms like fever, headache, thirst, and a heavy, oppressed feeling. Its aromatic quality allows it to disperse and vent summer-heat outward without drying out body fluids, making it gentler than many other cold-natured herbs.
'Intercepts malaria' (截疟 jié nüè) means Qīng Hāo can directly halt malarial episodes with their characteristic alternating chills and fever. This has been its most globally celebrated action since the discovery of artemisinin. In TCM practice, it is used either alone in large fresh doses or combined with other herbs to treat malarial patterns.
'Clears Liver and Gallbladder heat' reflects the herb's primary channel affinity. It can address heat lodged in the Liver and Gallbladder, which may manifest as bitter taste in the mouth, rib-side discomfort, irritability, or red eyes. This action also underlies its use in Damp-Heat jaundice, where Liver and Gallbladder heat combines with Dampness to produce yellowing of the skin.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Qing Hao 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 Qing Hao addresses this pattern
Qīng Hāo is bitter, pungent, and cold, entering the Liver and Kidney channels. In Yin Deficiency with Empty Heat, the body's cooling Yin fluids are depleted, allowing internal heat to flare unopposed. Qīng Hāo's cold nature directly clears this deficiency heat, while its pungent, aromatic quality gives it the unique ability to vent hidden heat from the Yin level outward to the surface. This 'clearing from within and venting outward' action distinguishes it from purely cold, descending herbs, making it ideal for heat that is trapped deep in the blood and Yin levels. Classical commentary describes it as able to 'lead heat from within the bones to the muscle surface.'
A practitioner would look for one or more of these signs
Especially with afternoon or evening heat
Night fever that resolves by early morning without sweating
Steaming bone sensation, flushed cheeks
Thirst from Yin fluid depletion
Why Qing Hao addresses this pattern
In the late stage of a warm-febrile disease (温病 wēn bìng), pathogenic heat may fail to fully clear and instead burrows into the Yin level, producing the classic pattern of 'night fever with early morning coolness, heat receding without sweating.' This occurs because defensive Qi enters the interior at night, where it meets the lingering pathogenic heat and drives up temperature. By morning, defensive Qi returns to the surface, and temperature drops, but the damaged Yin cannot produce enough sweat to expel the pathogen. Qīng Hāo's aromatic, pungent quality penetrates the Yin level and draws out this hidden heat, while its bitter coldness clears the heat directly. As Wu Tang noted in the Wen Bing Tiao Bian, Qīng Hāo 'cannot enter the Yin level alone' but paired with Yin-nourishing substances like turtle shell, it can reach deep and then lead the pathogen out.
A practitioner would look for one or more of these signs
Fever worse at night, cool in the morning
Or absence of sweating as fever recedes
Red tongue with little coating, signs of Yin damage
Why Qing Hao addresses this pattern
Summer-heat is an external pathogenic factor encountered during hot seasons that produces fever, thirst, irritability, and a heavy or oppressed feeling. Qīng Hāo is aromatic and cold, which allows it to both clear the summer-heat and disperse it outward without damaging body fluids. Unlike strongly bitter and drying herbs, its light, fragrant nature resolves heat gently, making it well-suited for summer-heat that has not yet deeply damaged the Yin.
A practitioner would look for one or more of these signs
Fever from summer-heat exposure
Headache with heavy, oppressed sensation
Thirst from heat consuming fluids
Why Qing Hao addresses this pattern
When Damp-Heat lodges in the Shaoyang (Gallbladder/Triple Burner), it produces alternating chills and fever (with heat predominating), bitter taste, chest oppression, nausea, and vomiting of bitter or sour fluid. Qīng Hāo enters the Liver and Gallbladder channels and excels at clearing heat from the Shaoyang level while its aromatic nature resolves dampness and turbidity. Classical physicians noted that it 'clears and vents Shaoyang heat' in a manner softer than Chai Hu, and without Chai Hu's tendency to injure Yin, making it better suited when heat and dampness coexist.
A practitioner would look for one or more of these signs
Chills and fever with heat predominating
Bitter taste in the mouth from Gallbladder heat
Vomiting bitter or sour fluid
TCM Properties*
Cold
Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)
Whole plant / Aerial parts (全草 quán cǎo)
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.