Cools Blood and stops bleeding — hemoptysis, epistaxis, hematuria, and uterine bleeding from Blood Heat
Clears Heat and resolves toxicity — carbuncles, abscesses, febrile illness, and skin infections
Dispels Wind and stops pain — headache, dizziness, and Wind-Heat-type pain syndromes
Disperses Blood stasis and reduces swelling — traumatic injury and Blood-stasis swellings
Secondary Actions
Lowers blood pressure — traditional use for Wind-Liver hypertension in Chinese folk medicine
External use: decoction wash for skin sores, carbuncles, and venomous bites
Classical References
Shen Nong Ben Cao Jing: lists Fei Lian (飞廉, 'flying scallop' — named for the prickly winged stems) in the middle grade for dispelling Wind, stopping pain, and treating bone-joint bi syndrome; one of the older documented thistle herbs in Chinese materia medica
Ben Cao Gang Mu (Li Shizhen): 'Fei Lian (Carduus crispus) dispels Wind Damp from the bones and sinews, treats headache and dizziness from Wind-Heat, and cools blood for bleeding — it is similar in action to Da Ji and Xiao Ji but weaker in stopping bleeding and stronger in dispelling Wind'
Modern Research
Active Compounds
Pectolinarin and linarin (flavone glycosides; anti-inflammatory, antihypertensive — shared with related Asteraceae thistles)
Luteolin and apigenin (flavonoids; anti-inflammatory, antioxidant)
Chlorogenic acid and caffeic acid (phenolic acids; antioxidant, antimicrobial)
Taraxasterol and β-amyrin (triterpenoids; anti-inflammatory)
Tannins (astringent, haemostatic)
Studied Effects
Anti-inflammatory: flavonoid fraction from Carduus crispus inhibits NF-κB and COX-2 in in vitro macrophage assays; the flavonoid profile (pectolinarin, luteolin) closely parallels the related Japanese Thistle (Cirsium japonicum, Da Ji) and confers similar anti-inflammatory and haemostatic pharmacology — validates the Blood-Heat cooling and toxin-resolving folk applications
Antihypertensive: pectolinarin and linarin produce vasodilation and blood-pressure reduction in hypertensive animal models via Ca2+-channel antagonism; consistent with the traditional Wind-Liver hypertension indication in Chinese folk medicine
Antioxidant: chlorogenic acid and caffeic acid from C. crispus demonstrate significant DPPH and ABTS radical scavenging activity in standard antioxidant assays; antioxidant capacity comparable to related Asteraceae medicinal herbs
Safety & Interactions
Contraindications
Cold-pattern bleeding without Blood Heat (pale blood, cold extremities, weak pulse) — cooling herb contraindicated in cold-deficiency haemorrhage
Spleen-Stomach Deficiency Cold — cool-bitter nature impairs digestive Yang with prolonged use
Cautions
Standard dose: 9–15 g dried herb or root in decoction; 30–60 g fresh herb
Antihypertensive drugs: additive blood-pressure lowering; monitor in patients on antihypertensives