Ms. Zhang, who teaches language, works very hard, and the middle school graduation class she leads has the highest average score in the city for language in every promotion exam. However, recently, she has been experiencing hoarseness, which often affects the effectiveness of her lectures. At first, Ms. Zhang did not care because sometimes the hoarseness symptom could be relieved automatically. However, after a period of time, Zhang noticed that the problem was getting worse, and now she is often unable to complete an entire class, and even if she is able to, she is reluctant to talk when she goes home and often loses her voice. Seeing that students sometimes do not listen, they would have liked to say more, but once they opened their mouths and found their voices very hard to hear, they also simply stopped talking. Ms. Zhang first went to a community doctor, who examined her and told her that she still needed to see a voice specialist for voice disorders and referred her to a voice specialist at a large hospital. After understanding her situation, the voice specialist examined her with a dynamic laryngoscope and found that she had grown a vocal fold groove, which was more difficult to recover from. This type of disease is mostly caused by improper use of the vocal cords, especially during upper respiratory tract infections caused by voice abuse. The treatment was first to correct her voice misuse using voice training. When the wrong voice usage was corrected, the efficacy was observed, and if the efficacy was not good, then surgery was needed to treat it. In this way, Ms. Zhang began to train her voice once every two weeks under the guidance of her doctor, and she insisted on practicing at home every day. After two months, Ms. Zhang’s voice was no longer muffled, and her lectures were not so hard. Ms. Zhang felt that she should spread her experience to other teachers so that more teachers and students could benefit. Unscientific use of the voice can lead to different laryngeal diseases, such as vocal cord nodules, vocal cord polyps, vocal cord cysts, and in severe cases, vocal cord leukoplakia or malignant tumors. The most common voice diseases are vocal cord nodules, followed by vocal cord polyps and vocal cord grooves. To treat these diseases, some of them only require voice training, while others require surgery. But it is more important to prevent them, and for those who use their voice professionally, it is more important to protect their voice. How to protect your voice? First of all, prevention is based on living habits. It is very important to drink 2000mL of water several times a day to keep the throat moist. Eating less overly sour, spicy and sweet diet can reduce the irritation to the throat. In addition, reducing throat-clearing actions can reduce damage to the larynx. When lecturing, using a loudspeaker as much as possible can reduce the fatigue of the vocal cords. Secondly, reducing diseases of the adjacent organs is also an important part of laryngeal disease prevention. For example, patients who always have acid reflux or runny nose need to be treated for gastric and nasal diseases, and they should actively exercise to reduce the chances of upper respiratory tract infections, etc. Finally, scientific voice training can also greatly reduce the incidence of laryngeal diseases by keeping the larynx relaxed at all times when speaking.