Suddenly itchy throat is considered to be caused by physiological factors such as drinking too little water and dry environment, or it is considered to be caused by pharyngitis, asthma and other diseases. 1. Physiological factors: drinking too little water, the environment is dry, can lead to dry throat, appear throat suddenly itchy situation. This is a normal phenomenon, no need to worry too much. 2. Pharyngitis: the cause of pharyngitis is related to viral infection, bacterial infection, irritating gas, long-term alcoholism and other factors. Patients will experience dry, itchy pharynx, difficulty in swallowing and other symptoms, which are manifested as a sudden itchy throat. 3. Asthma: Asthma may be caused by heredity, environmental factors, climate, mental stimulation and other factors. When patients are exposed to allergens, they may experience a sudden itchy throat accompanied by wheezing, shortness of breath, chest tightness and other symptoms. There are many reasons for the sudden itchy throat, and patients are advised to go to the hospital in time and undergo relevant examinations so as to clarify the cause of the disease. In daily life, we need to ensure adequate sleep, do not overwork, appropriate physical exercise, enhance physical fitness, improve the body’s immunity.