Itchy throat and cough with phlegm may be related to allergic pharyngitis, chronic pharyngitis, reflux pharyngitis and other diseases. 1. Allergic pharyngitis: If you come into contact with allergy-prone substances, resulting in an allergic reaction, you will have the symptom of itchy throat and cough with phlegm. 2. Chronic pharyngitis: repeated episodes of acute inflammation and stimulation by adverse physical and chemical factors can cause edema and hypertrophy of the mucous membrane and submucosal tissues of the pharynx, increased nerve sensitivity and glandular secretion, and inflammatory factors can cause irritation in the throat, thus leading to the symptom of itchy throat and coughing with phlegm. 3. Reflux laryngitis: acid reflux causes irritation to the throat area, which can also lead to the phenomenon of itchy throat, cough and phlegm. The reason for this is the fact that it is not easy to find the best way to get the best out of the situation.