A Complete Collection of 100000 Whys
Fav十万个为什么
为什么人会打喷嚏？
人会打喷嚏，主要基于以下几个原因：
1、鼻腔受到刺激：当鼻腔受到灰尘、花粉、冷空气、化学物质等刺激时，会引发喷嚏反射。这是身体的一种防御机制，旨在通过喷嚏将刺激物排出鼻腔。
2、过敏反应：过敏性鼻炎等过敏性疾病会导致鼻黏膜敏感，接触过敏原（如花粉、宠物皮屑等）时，会引发喷嚏。这是免疫系统对过敏原的反应。
3、光喷嚏反射：约10%~35%的人对强光（如阳光或灯光）敏感，会触发喷嚏，这种现象被称为“光喷嚏反射”，其机制尚不完全明确。
总结：打喷嚏是身体的一种保护性反射，通常由鼻腔受到刺激、过敏反应或光喷嚏反射引起。这些机制帮助清除鼻腔内的异物或刺激物，从而维护呼吸道的健康。
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