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喉梗阻又名喉阻塞。

它不是一个独立的疾病，而是由喉部及其周围邻近组织的病变而引起的以吸气期呼吸困难为特征的综合征。

喉的声门区是上呼吸道最狭窄的部位，病变时喉粘膜充血肿胀声门变窄，吸气时气流把两侧声带向下向内推压，使声门更为狭窄，造成呼吸困难，在呼气时气流向上冲开声带，声门比吸气时为大，呼吸困难并不显著，气注以通过狭窄的喉腔，震动而发生鸣声，称为喉鸣音。

吸气时胸腔内负压加大，胸廓周围软组织出现凹陷，如胸骨上窝，锁骨上，剑突下，肋间隙陷称为“四凹症”。呼吸困难可出现缺氧，有面色口唇发紫，脉搏加快，烦躁不安等晚期症状。如病变在声带则常有声音嘶哑。

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