The performance of 2-year-old boy coughing hoarse voice is mostly caused by acute laryngitis, vocal cord inflammation, lung infection and other factors. 1. Acute laryngitis: due to viruses or bacteria and other pathogenic microorganisms invade into the throat, the mucous membrane of the laryngeal compartment caused damage, so that the laryngeal compartment of the tissue of the inflammatory reaction such as congestion, edema, which caused the boy cough hoarse symptoms. 2. Vocal cord inflammation: often crying or viruses, bacteria and other attacks on the human vocal cord tissue, can lead to edema and other aseptic inflammation of the vocal cords, thus affecting the respiratory function of the human body, coughing hoarse situation. 3. Lung infection: when the lung tissue bacteria, fungi and other infections, will lead to coughing symptoms, and coughing will stimulate the throat tissue, which will cause hoarse voice. Since there are many causes of coughing and hoarseness in a 2-year-old boy, it is advisable to take your child to the hospital.