Fever of 38 degrees accompanied by cough can be seen in acute upper respiratory tract infection, pneumonia, tuberculosis, lung cancer and other cases, but does not mean that only in the above cases, taking cephalosporin for acute upper respiratory tract infection, pneumonia, etc. may be effective for tuberculosis, lung cancer, etc. Ineffective. 1. Acute upper respiratory tract infection is a common disease caused by bacterial infection, then cough, fever taking cephalosporins may be effective. If mycoplasma, legionella, viral infection is invalid. 2. Pneumonia, similar to acute upper respiratory tract infections, can be caused by gram-negative bacterial infections, so taking may also be effective. It is not effective in mycoplasma, legionella, or viral infections. 3. Tuberculosis, fever is a typical symptom of tuberculosis, due to tuberculosis mycobacteria infection leading to fever, taking cephalosporin is ineffective, anti-tuberculosis treatment is needed. 4. Lung cancer, fever caused by malignant tumor, anti-tumor treatment is needed, cephalosporins do not have therapeutic effect on tumor. Cephalosporins do not have therapeutic effect on tumors. It is necessary to have clear indications for the use of medicines, and can be used only after a doctor’s prescription, and it is recommended to consult a doctor in time and according to the doctor’s instructions.