變聲係人類喺青春期所發生嘅一種生理變化，男女都會變聲，不過男仔變得沉多啲，女仔變得沉少少。男性通常喺12至16歲；女性通常喺13至16歲，最遲變聲亦有可能會到16歲左右。成年之後聲音通常都唔會再改變。
唔適宜食用辛辣嘅食物，避免吸煙飲酒等。建議講嘢或者唱歌嗰陣唔好勉強提高把聲。
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