After being infected with AIDS, the onset of the disease can be as short as 2-3 years or as long as 10 years. During the incubation period, AIDS-infected patients will not have obvious uncomfortable symptoms and their quality of life will not be affected. At this time, the immune function of the body is still in a relatively sound state, the lymphocytes have not dropped significantly, and the patient looks healthy and has no symptoms, which can easily lead to the underdiagnosis of AIDS. When the onset of AIDS enters the pathogenic stage, patients can show various clinical manifestations, some of which are cold symptoms, general fatigue and weakness, loss of appetite, fever, etc. As the disease worsens, it can gradually invade the internal organs and develop unexplained persistent fever, which can last up to 3-4 months. Complications such as cough, shortness of breath, diarrhea, blood in stool and enlarged liver and spleen can also occur.