A hoarse voice can be caused by physiological factors such as excessive use of the voice; it can also be caused by diseases such as vocal cord nodules and vocal cord polyps. Physiological factors: If you drink too little water recently, use your voice excessively, or stay in a dry environment for a long time, it may lead to hoarseness. 2. Vocal cord nodules: Improper use of voice, upper respiratory tract infections and other reasons may induce vocal cord nodules, resulting in the patient’s voice is hoarse without pain; there may also be delayed articulation, change in timbre and other symptoms. 3. Vocal polyps: If frequent dust operations, chemical industry, may induce vocal polyps. The patient may have a hoarse voice without pain or itching, and may also experience symptoms such as narrowing of the voice range and restricted vocalization. If the voice is hoarse without pain or itching, it is recommended that the patient go to the hospital to find the cause of the disease and receive treatment as soon as possible after physiological factors are ruled out.