Frequent lectures and sore throats may damage the vocal cords. Frequent lecturing and talking will stimulate the pharyngeal mucosa edema and inflammation, while the inhaled dust stimulates the pharyngeal mucosa caused by inflammation, the vocal cords are in a long-term working condition as well as stimulated by inflammation will be damaged. The pharynx is generally in a closed environment, to maintain a moist state, such as frequent lectures, the respiratory tract is often in an open state, will inhale some dust particles, stimulate the mucous membrane of the pharynx, resulting in pharyngeal mucosal edema and congestion, caused by inflammation of the pharynx. Vocal cords in the throat, is the body’s normal vocal organs, need to rest to recover, not often long time with the voice, often lecture, the vocal cords do not get a rest, to the inflammation of the pharynx, easy to lead to swelling and congestion of the vocal cords, caused by vocal cords, vocal cords, polyps and other damage. Sore throat hoarseness should be rushed to the hospital in a timely manner, under the guidance of a professional doctor for treatment, so as not to delay the condition.