The child’s throat itchy old hmmmm may be the symptomatic manifestation of certain diseases, such as laryngitis, tonsillar hypertrophy, upper respiratory infections and so on. 1. Laryngitis: especially allergic laryngitis, when in contact with pollen, mites, dust and other allergens, there is often an itchy feeling in the throat, and then involuntarily emit hmmmm sound. In simple pharyngolaryngitis, there is inflammation of the mucous membrane or submucosa, and when eating spicy food or gastric reflux, there can be throat itching and foreign body sensation. 2. Tonsillar hypertrophy: when there is bilateral tonsillar hypertrophy, especially during acute inflammation, it is easy to stimulate the mucous membrane of the voice itchy, always conscious of a foreign body sensation, emit mmmmm sound. 3. Upper respiratory tract infections: common bacterial or viral infections, causing congestion of the mucous membrane of the voice, can show itchy feeling, increased secretion, easy to emit hmmmm sound. In short, it is recommended to consult a regular hospital in time for a clear diagnosis of throat discomfort and targeted treatment.