AIDS is clinically divided into four stages: acute infection, asymptomatic infection, pre-AIDS stage, and AIDS stage. The acute infection stage refers to the period starting about half a month after the human body is infected with HIV, during which symptoms similar to the common cold appear, and these symptoms generally disappear after a month. Around two months, HIV antibodies can appear in the human body, at which point these antibodies can be detected through blood testing. Thereafter, the individual enters the asymptomatic infection stage, which typically lasts 7-8 years, though some people may reach 10 years. Afterwards, the pre-AIDS stage begins due to the decline in immune function, with symptoms such as fatigue, night sweats, and weight loss appearing, eventually progressing to the AIDS stage.