The distinctive feature of the early stage of AIDS (acute stage) is fever, which may be accompanied by headache, diarrhea, muscle aches and other general discomforts, but it is not specific and cannot be used for diagnosis. Two to four weeks after HIV infection, a large number of viruses enter the body to destroy the immune system, the human immune system in the process of reacting with the virus can appear fever, which can be manifested as a persistent low or high fever, and some people may be accompanied by headache, diarrhea, muscle aches and other discomfort. However, these symptoms are not specific and can be caused by colds and systemic diseases. To summarize, fever is a distinctive feature of the acute phase of AIDS, but it is not specific. Therefore, symptoms cannot be used as the basis for diagnosis of AIDS, and it is recommended to take the HIV antibody test promptly after the window period to rule out the risk of infection.