Clinically, HIV infection is divided into acute phase, asymptomatic phase, and AIDS phase. HIV fever generally appears in the acute phase and AIDS phase, and the fever varies in different stages, with mild fever around 37-38°C and severe fever around 38-39°C. 1. Acute phase: i.e., 2-4 weeks after HIV enters the body, most cases are mild fever, around 37-38°C, usually accompanied by headache, nausea, night sweats, diarrhea and other symptoms, which are relatively mild and can resolve on their own. This is because during the acute stage of infection, the virus replicates in the body in large quantities for a short period of time, and viraemia occurs, and the immune system will secrete some substances to make the body temperature rise; 2. In addition, because the body is in a state of extreme immune deficiency during the AIDS period, there is also the possibility of complications of various serious infections and even tumors. In addition, it is recommended to take safety measures during sex, avoid having multiple partners at the same time, and stay away from drugs to prevent HIV infection.