The causes of long-term hoarseness and loss of voice in young children are varied and can be divided into physiological and pathological causes, with pathological causes mainly being ear, nose and throat diseases. 1. Physiological: If the weather is dry for a period of time, and not enough drinking water, it will lead to hoarseness due to lack of water, and children will cry loudly when they feel uncomfortable, which will lead to hoarseness and loss of voice due to excessive use of voice, which is a normal physiological phenomenon, and can be restored by replenishing the water, and there is no need for additional treatment. 2. Pathological: Ear, nose and throat diseases are the most common causes of hoarseness and loss of voice in young children, and common representative diseases include chronic pharyngitis, chronic laryngitis, vocal polyps, laryngeal cancer and vocal cord nodules, which can damage the vocal cords and lead to hoarseness and loss of voice. If the symptoms are suspected to be pathologic, it is recommended that the family bring the child to the hospital in a timely manner.