肺癌症狀初期之所以不存在,原因其實很簡單。我們感覺到的疼痛和不適,是我們體內神經所觸發的身體反應,但我們的肺部裡卻少有這些末端神經,所以得以悄悄地增生,這也是為何肺癌症狀初期十分「無感」。美國肺癌基金會(Lung Cancer Foundation of America)指出,很多肺癌早期診斷都是於非關肺癌檢測及篩檢時偶然被發現的。(同場加映:肺癌3大原因:抽菸、空氣汙染、遺傳和病史)
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