A<unk>  or<unk>  mutation, sometimes referred to as a<unk>  break or<unk>  crack, commonly refers to the deepening of the<unk>  of people as they reach puberty. Before puberty, both sexes have roughly similar vocal pitch, but during puberty the male<unk>  typically deepens an octave, while the female<unk>  usually deepens only by a few tones. A similar effect is a<unk>  crack", during which a person's<unk>  suddenly and unintentionally enters a higher register (usually falsetto) for a brief period of time. This may be caused by singing or talking at a pitch outside the person's natural vocal range, stress, fatigue, emotional tension, or the physical<unk> s associated with puberty. An instance of a<unk>  crack (when associated with puberty) lasts for only a moment and generally occurs less frequently as a person grows into maturity.
Voice change
Bad breath
Sneeze
Cough
Liquid breathing
Dryness 
Sore throat
Night Sweats