It is not necessary to have a fever to have AIDS, but fever is a common and typical symptom of AIDS. AIDS has different clinical symptoms at different times. AIDS can be divided into three phases, namely the acute phase, the asymptomatic phase and the AIDS phase. The acute phase usually occurs 2-4 weeks after the initial HIV infection. Some infected patients develop symptoms resulting from HIV viremia and acute damage to the immune system, and most patients have mild clinical symptoms that last 1-3 weeks and then resolve, and patients may enter the asymptomatic phase from the acute phase or go directly to the asymptomatic phase without obvious acute phase symptoms. The asymptomatic phase can generally last 6-8 years, and its duration is related to individual differences such as the number and type of infected virus, the route of infection, and the immune status of the body. The AIDS stage is the final stage after HIV infection, mainly manifested by HIV-related symptoms, signs and various opportunistic infections and tumors.