Girls with voice change may show signs of hoarseness, narrowing of voice range, fatigue of articulation, and foreign body sensation in the larynx. Usually when the patient reaches puberty, secondary sexual characteristics appear, followed by changes in voice and other conditions. Usually, the patient’s voice change period is around 12 to 14 years of age, but it is not absolute. It takes about six months to a year to go from a young child’s voice to an adult female’s voice, and the main signs include hoarseness, narrowing of the vocal range, fatigue of articulation, and a foreign body sensation in the larynx. Usually, during the period of voice change, patients can find out conditions such as vocal cord congestion and laxity of closure through fiberoptic laryngoscopy and other examinations. Visually, the patient’s throat does not change significantly, but the range narrows by about 3 degrees. If the patient becomes unwell during the development process, it is recommended to seek medical attention and follow the doctor’s advice for relevant treatment.