Acute upper respiratory tract infections, also known as colds, usually have symptoms of the upper respiratory tract as their main manifestation, such as sore throat, occasional low-grade fever, patients may also have a runny nose, sneezing, nasal congestion, general tenderness, weakness and other discomforts. If you have a sore throat with recurrent fever, pay attention to the presence of acute purulent tonsillitis, because viral colds can sometimes cause inflammatory reactions in the throat secondary to bacterial infections. Sometimes, sore throat and low fever can also be caused by infectious diseases of the lower respiratory tract, such as acute bronchitis or even pneumonia, so when sore throat and low fever occur, it is necessary to improve the throat examination as well as blood tests and chest X-ray to clarify the cause.