Girls have a voice change, which usually occurs during puberty. Generally, girls’ voices change between the ages of 12 and 14, and no later than 16, but there are individual variations. When a girl’s voice changes, her larynx becomes narrower, her vocal cords are shorter and thinner, and they vibrate at a higher frequency, resulting in a finer and higher pitch. When they speak or sing, their voices are not natural and they are prone to vocal fatigue. During laryngeal examination, the vocal cords may become congested and edematous, accompanied by an increase in secretions. The period of voice change usually lasts from half a year to one year. During the period of voice change, you need to protect your vocal cords, don’t shout or use your voice excessively to avoid lifelong hoarseness due to damage to the vocal cords.