Itchy throat, cough and white phlegm are seen in laryngitis, bronchitis and other diseases, which can be clarified through laryngoscopy, chest CT scan and other examinations. 1. Laryngitis is an inflammatory disease of the mucous membrane of the pharynx, which is mainly characterized by tickling of the throat, irritating cough and phlegm in the throat, etc. The condition can be clarified through laryngoscopy. Laryngoscopy can see the pharyngeal mucosa congestion, lymphoid follicles red and swollen phenomenon. 2. Bronchitis is an inflammatory disease of the bronchial mucosa, mainly manifested as irritating cough, coughing up sputum, accompanied by symptoms such as itchy throat. X-ray or CT scan of the chest will show thickening of the lung texture. If you have any of the above conditions, you need to go to the hospital, clarify the cause of the disease, and follow the doctor’s instructions for treatment.