Sudden hoarseness of the child’s voice is considered to be related to various factors such as crying, angioneurotic edema, laryngitis and so on. 1. Crying, children usually like to cry, crying for a long time may lead to sudden hoarseness. 2. Angioneurotic edema, if a small child comes into contact with substances that are easily allergic, allergens stimulate the throat area and appear. Angioneurotic edema, may lead to congestion and edema of the throat, so there will be a sudden hoarseness of the voice symptoms. 3. pharyngitis, some children appear pharyngitis throat congestion, inflammatory secretions increase, may stimulate the child’s voice, the child voice suddenly hoarse symptoms. Children’s voice suddenly hoarse, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.