No cold or cough is fever, which needs to be considered from the following aspects: First, you need to consider that it may be a urinary tract infection, such patients are often fever, back pain, frequent urination, urinary urgency, painful urination, patients will appear to urinate as red urine, urinary tract burning-like pain when urinating, and there is a feeling of inability to urinate, you can do urine routine, urine bacterial culture, kidney ultrasound, blood tests to clarify the diagnosis The diagnosis can be made by urine routine, urine bacterial culture, kidney ultrasound, blood test, etc. Secondly, if the patient has fever combined with nausea, vomiting and pain in the right upper abdomen, it should be considered as a result of biliary infection. Such patients often have a past history of cholecystitis and gallbladder stones, so routine blood tests, liver, gallbladder and spleen ultrasound, and liver function tests are recommended to clarify the diagnosis. In addition, there are other patients who have joint pain in addition to fever, so it is necessary to consider rheumatic immune system diseases, such as rheumatic fever, rheumatoid arthritis, and a large group of other rheumatic immune system diseases can appear recurrent fever, it is recommended to do rheumatoid factor, anti-O, ultrasensitive C-reactive protein, anti-nuclear antibody profile and other tests to clarify the diagnosis.