You can tell that a girl’s voice has changed based on the characteristics of her changing voice. Most girls begin to enter the period of voice change at the age of twelve or thirteen, and the common manifestation is that the range of voice becomes narrower, for example, when singing, the high notes usually can’t go up, and it’s difficult to make out the low notes. It is easy to feel fatigued when talking too much, and it is easy to have a hoarse voice. During the period of voice change in girls, after the clinician’s examination, it can be found that the vocal cords are obviously congested, the vocal cords become thicker, and sometimes there is also a certain degree of edema. After a girl’s voice changes, there will be obvious changes in her voice, the tone of her voice becomes thin and high, and her voice changes from a childish child’s voice to a mature woman’s voice.