The main clinical symptoms of pneumonia are fever, cough, sputum or chest pain and dyspnea, but not all pneumonia has fever, and not just cough or fever is necessarily pneumonia. There are many causes of pneumonia, including bacteria, viruses, fungi, mycoplasma, chlamydia, etc. Pneumonia caused by viruses or pathogens does not usually cause fever, but only inflammation of the bronchi or bronchoalveoli, resulting in coughing and wheezing, not necessarily a combination of fever. On the other hand, fever is the body’s own defense mechanism, if the body is less responsive, such as children, the elderly and some people with underlying diseases, the clinical symptoms of pneumonia are generally not obvious, and may not necessarily be accompanied by fever, but only a mild cough, and some early symptoms of pneumonia are generally only runny, coughing and other symptoms of common upper respiratory tract infections, with the development of the disease later fever symptoms. The main indicators for diagnosing pneumonia are not cough and fever, but mainly imaging support. The diagnosis can be confirmed by doing a chest X-ray or CT in a regular hospital, combined with laboratory serological tests and clinical symptoms. Therefore, we should not simply rely on whether the patient has fever and cough and other symptoms to determine whether the patient has pneumonia, but should go to the hospital to receive formal examination to confirm the diagnosis.