火毒內閉証(syndrome/pattern of fire toxin blocking the internal),中醫証候名,屬火毒內攻証類,因火熱邪毒熾盛,內閉臟腑氣機所致。臨床以持續高熱,體溫驟降,身體灼熱,四肢厥冷,氣粗、口臭,舌質紅絳,舌苔黃褐而干,脈弦滑數,伴見神昏、譫妄,躁動,或循衣摸床,撮空理線等為特徵的証候。[1]