血管舒张是指在血管壁平滑肌松弛下,令体内血管扩阔的情况。由于空间增大让血液流过,这会降低了血压。它的相反过程称为血管收缩

血管舒张可以自然产生或经由血管舒张剂引起。某些肌肉神经是在体内负责控制血管舒张的,称为“血管舒缩肌肉/神经”。而血管舒张剂是一种物质能引起血管舒张。多种血管舒张剂被用作让血液容易流过血栓药物,一般使用后都会出现晕红等情况。

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