Low-grade fever and cough can be seen in many diseases, such as tuberculosis, lung tumor, mycoplasma infection, bacterial infection and so on. When patients have the above clinical symptoms, it is recommended to actively seek medical treatment, improve blood routine, C-reactive protein, mycoplasma antibody, calcitoninogen, viral antibody, sputum culture, chest radiographs, lung CT, sputum test for antacids, tumor series, and improve bronchoscopy if necessary, to make a clear diagnosis, and according to the diagnosis to take the appropriate treatment. If the patient has low fever and cough due to pulmonary tuberculosis, anti-tuberculosis drugs, such as isoniazid, rifampicin, pyrazinamide, streptomycin and so on, can be given according to the condition. If the symptoms of low fever and cough are due to lung tumor, surgical treatment, radiotherapy, chemotherapy, etc. should be given according to the condition.