Clearing heat and purging fire

"Clearing heat and purging fire" (Qing Re Xie Huo) is a fundamental therapeutic principle in Traditional Chinese Medicine (TCM) used to treat syndromes characterized by excessive internal heat, high fever, and inflammation. It is not a specific molecular target like a receptor or enzyme but rather a clinical classification of medicinal actions. This principle is typically applied to patients exhibiting the 'Four Bigs': big fever, big thirst, big sweat, and a big pulse, which frequently correlate with modern pathological conditions such as severe infection or systemic inflammatory response. Medicinal substances classified under this principle, such as Gypsum Fibrosum and Anemarrhena asphodeloides, exert broad pharmacological effects including antipyretic, anti-inflammatory, and antimicrobial activities. Research indicates that these herbs may function by modulating multiple molecular pathways, including the NF-kappaB and MAP kinase signaling cascades, rather than binding to a single discrete target. Because it represents a holistic treatment category, identifying a single canonical abbreviation or molecular family is not applicable in a conventional pharmacological context.

Other names

Qing Re Xie HuoHeat-clearing and fire-purgingPurging intense heatSedating fire

In Traditional Chinese Medicine (TCM), this principle acts by eliminating pathogenic heat from the Qi level or internal organs (Zang-fu). Pharmacologically, substances in this category often act as multi-target agents that inhibit pro-inflammatory cytokines (e.g., TNF-α, IL-1β, IL-6), modulate the arachidonic acid metabolism pathway (COX-2 inhibition), and interact with the thermoregulatory center in the hypothalamus to reduce body temperature.