圣城拉萨的暑期，布达拉宫、大昭寺、哲蚌寺等寺庙进入旅游最高峰。游客摩肩接踵，加上拉萨今夏罕见的高温闷热，使寺庙内部空气流通更差，耗氧量急剧上升。一个此前被严重忽视的危险随之凸显：高原反应与中暑症状极易相互叠加和误判。不少游客在闷热的寺庙里感到剧烈头痛、恶心、无力，以为只是普通高反，结果症状急速加重。医生反复强调：在高原闷热环境中出现此类症状，直接吸氧并紧急下撤是首选。

高原反应的核心是低氧，导致脑和肺血管扩张、组织间液渗出，引发头痛、呕吐。中暑则是体内热量蓄积，导致体温调节中枢失衡。但在大昭寺狭窄的转经道或布达拉宫陡峭的木梯上，大量人体散发的热气和湿气集中在一个小空间里，身体遭受着缺氧与闷热的双重打击。此时出现的头痛、心慌、浑身软绵，很难分清是高反还是中暑。如果只是按高反处理，坐在原地“扛一扛”，或错误地服用退烧药，会耽误降温补液的最佳时机，可能迅速进展为脑水肿或热射病。

因此，进寺庙游览时，若出现越来越重的头痛、步态不稳、面色潮红、身体发烫，不要纠结原因，应立即做两件事：第一，在同伴搀扶下，迅速离开拥挤闷热区域，到室外阴凉通风处。第二，立即通过随身携带的便携氧气罐吸氧，缓缓补充温水或电解质水，并用湿毛巾冷敷额头和颈部降温。吸氧在高原既能缓解低氧，也有助于机体应对应激状态。如果症状在十五分钟内无任何好转，立即呼叫120。在高原，任何不适都不可轻视，及时吸氧和降温，就是最有效的救命第一步。

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