Do not catch a cold, do not cough is to have a fever how to return a responsibility

This kind of situation is considered to be related to virus infection. When the immunity of the body is low, it is easy to be infected by virus, which may not necessarily cause symptoms of cold and cough; it may also be related to non-infectious diseases. Diseases such as blood diseases, malignant tumors and hyperthyroidism may also cause fever, but there will be no symptoms of cold and cough.