After boys and girls enter puberty, the secondary sexual characteristics of the body will be more obvious due to the stimulation of sex hormones and pituitary hormones in the body. Boys will have enlarged Adam's apple, simple voice and beard;

Girls will have menstrual cramps and enlarged breasts. The voices of some girls will change at this time. This process from children's voice to adult's voice is called voice change period.

People usually change their voices between 1 1 ~ 16 years old, and the period of voice change can last about 1 ~ 2 years. The occurrence of voice change period is related to people's geographical location, social environment, living standard and genetics. People who grow up in the south and have good living conditions can change their voice 1 ~ 2 years earlier, while those who grow up in the north and have poor living conditions can change their voice/0/~ 2 years later.

Voice change is a physiological process, not a disease. However, if people don't protect their voices during the voice change period, they will also cause diseases, such as chronic laryngitis, vocal nodules, vocal polyps and so on. To this end, children should pay attention to the following points when changing their voices:

① Pay attention to diet and avoid cold and spicy food;

2 avoid catching a cold, so as not to make the vocal cords congested and swollen;

(3) avoid shouting. You should not use sound for more than 2 hours every day. You should try to rest your vocal cords.

④ Take part in sports appropriately and pay attention to the combination of work and rest.

Please don't worry, this is a normal physiological phenomenon. Pay more attention and don't use your voice too much.