Symptoms of respiratory tract infections include cough, runny nose and sore throat. 1. Cough: Respiratory tract infections can irritate the mucous membrane of the throat and cause itching of the mucous membrane of the throat, resulting in continuous coughing. 2. Runny nose: respiratory tract infection when the mucous membrane of the nose, throat and larynx is stimulated will lead to increased secretions, with the development of the disease will lead to nasal secretions out of the body triggered by the flow of watery nasal discharge. 3. Sore throat: respiratory tract infection is a common disease, mainly due to inflammation stimulation, when the mucous membrane of the throat is stimulated by inflammation may lead to itching, and itching is serious when it causes sore throat. In addition, respiratory infections may also cause headache, fever, dry and itchy throat and burning sensation, etc. It is recommended to go to the hospital in a timely manner to clarify the cause of the disease and follow the doctor’s instructions for treatment.