小儿水肿·水毒内闭证(infantile edema with syndrome of internal blockade of water-poison)是指水毒浊邪壅塞三焦,气机升降失常,以全身浮肿,尿少或尿闭,头晕头痛,恶心呕吐,口中气秽,腹胀便溏,甚或神昏,苔腻,脉弦为常见症的小儿水肿证候。