A sore throat without phlegm is considered to be caused by acute pharyngitis, acute epiglottitis, acute tonsillitis and other diseases. 1. Acute pharyngitis: Acute pharyngitis patients will have dry throat, sore throat and other symptoms, which will lead to the patient to appear phlegmless throat pain. Its causes are mostly related to pathogen infections such as coxsackie virus, streptococcus, and streptococcus pneumoniae. 2. Acute epiglottitis: the cause of acute epiglottitis is related to infection and allergic reaction, etc. Patients will have severe sore throat, difficulty in swallowing and other symptoms, usually without sputum. 3. Tonsillitis: the cause is related to infection, immune factors, etc., the patient’s typical symptom is sore throat, the pain is especially significant when swallowing, which will lead to the patient’s phlegmless throat pain. If you have a sore throat without phlegm, you should go to the hospital in time to find the cause of the disease, and then follow the doctor’s instructions according to the cause of the corresponding treatment.