After HIV infection, more than half of the patients will have flu-like symptoms for about a month, such as headache, fever, fatigue, sore throat, general discomfort, and swollen lymph nodes. However, these conditions can subside on their own within a month, even without the application of medication. Therefore, it is difficult to distinguish these clinical symptoms from the common cold directly from the outside, even if the patient undergoes routine blood tests such as routine blood tests. Therefore, if a patient is afraid that he or she is infected with AIDS after having high-risk sex, he or she should go to a regular medical institution to have a blood test for HIV antibodies to confirm the diagnosis, and should not rely solely on the external clinical manifestations.