Itchy throat with phlegm and cough may be caused by upper respiratory tract infection, chronic pharyngitis, allergic diseases and other reasons. 1. Upper respiratory tract infection: this disease is usually caused by viral infections. After being infected by viruses, it is easy to cause damage to the mucous membrane of the upper respiratory tract, which results in itchy throat, phlegm and cough. It may also be accompanied by nasal congestion, runny nose, fever and other symptoms. 2. Chronic pharyngitis: This disease is usually caused by long-term poor diet, long-term exposure to dust, or prolonged excessive use of the voice. Due to the existence of chronic inflammatory reaction in the throat area, under the stimulating effect of inflammatory factors, it can lead to itchy throat, phlegm, cough, always want to clear the throat, especially in the morning often appear irritating cough symptoms. 3. Allergic diseases: such as cough variant asthma, allergic pharyngolaryngitis and other diseases, may lead to patients with itchy throat, phlegm, cough, and cough out of the phlegm is usually foamy phlegm. Itchy throat with phlegm cough, may also be caused by other reasons, it is recommended to seek medical advice as soon as possible, through further improvement of the relevant examination, a clear diagnosis, by the doctor’s guidance for treatment.