The causes of coarse voice may include smoking and drinking, excessive use of voice, upper respiratory tract infection, and vocal cord neoplasia. Patients are advised to visit the ENT department of regular hospitals in time, and the symptoms of coarse voice will be improved by actively treating the original disease. 1. External stimulation: Patients who smoke and drink for a long time, the mucous membrane of the vocal cords is stimulated by tobacco or alcohol, which will lead to congestion and hypertrophy of the vocal cords, resulting in coarse voice. 2. Excessive use of voice: If you use your voice excessively and shout loudly for a long time, it leads to voice fatigue and cannot be effectively If you have a recent history of upper respiratory tract infection caused by cold or flu, you may also experience thickening of the voice; 4. The surface is not smooth, causing the voice to become thicker; 5, vocal fold relaxation: the tension of the vocal folds of the elderly becomes poor, the vocal folds are relaxed, poorly closed, and there is a gap in the middle of the vocal fissure, which will also cause the voice to become thicker.