There are more causes of hoarseness, generally the following: 1, due to acute and chronic laryngitis, which is caused by acute upper respiratory tract infection, caused by acute congestion, edema and incomplete closure of the bilateral vocal folds, and hoarseness. This is due to acute upper respiratory infection, which causes acute congestion, edema and closure of the bilateral vocal folds, and can be cured in about 10 days. 2. Benign and malignant tumors of the vocal folds, often including vocal fold nodules, vocal fold polyps or laryngeal cancer, can be clearly diagnosed by examining electronic laryngoscopy. Vocal fold nodules and vocal fold polyps often occur in the anterior middle third of the vocal folds, with a pale white, smooth surface neoplasm. Laryngeal cancer appears anywhere in the larynx and often presents as a cauliflower-like neoplasm in the larynx that bleeds easily and is brittle. Local pathology is required, and surgery is required when the pathology results are clear.