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尿液其實比口水乾淨 醫揭3個冷知識:有異味恐是感染徵兆

ETtoday
2025/07/17 | 2分鐘閱讀

記者邱俊吉/台北報導

尿液是人類每天都會面對的生理現象,但多數民眾可能認為尿是「髒東西」,對此兒科醫傑登醫師於臉書「傑足先登 傑登醫師」分享,其實這是錯誤觀念,若身體健康,膀胱裡的尿沒有細菌,「比口水還乾淨」,至於尿騷味則是尿素接觸空氣的結果,剛排出的尿幾乎無味。

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傑登醫師於臉書寫道,一般民眾可能不知道尿液暗藏不少身體祕密,故整理以下3個冷知識,幫網友更加認識「黃金水」:

●尿液其實無菌。健康人的尿液在膀胱內無菌,比口水乾淨,只有當尿液排出後,接觸到尿道口或環境,才可能混入細菌,故健檢會採中段尿或導尿方式來檢查泌尿道感染,也所以家長幫寶寶換尿布時被尿液噴到,其實也不必太緊張。

●尿液為何呈現黃色?這是因為尿中含有紅血球代謝產物「尿膽素」,其可反映身體狀況,若顏色太深,可能水喝太少;幾乎無色,可能是喝太多水或服用利尿劑的結果。

●尿騷味從何而來?其實尿液剛排出時幾乎無味,但當其中的尿素與空氣接觸後,會被細菌分解成氨,接著便會產生俗稱阿摩尼亞的味道,也就是大家熟悉的「尿味」;此外,某些食物會改變尿味,例如蘆筍、咖啡、蒜頭或高劑量B群等,此屬正常現象,但若出現甜味、腐敗味或魚腥味,則應注意可能是糖尿病或感染徵兆,要及早就醫。

傑登醫師於文中提醒,對於其他尿液異常狀態切勿忽視,例如解出紅色尿,但沒吃甜菜根、火龍果,可能是血尿;若排出紅褐色尿或茶色尿,又有黃疸、倦怠,要提防「溶血性貧血」;尿液持續有泡泡,超過1至2分鐘仍不散,則須注意可能是是腎功能異常引起蛋白尿。這些異常都不容輕忽,須儘速就醫。

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