The time between infection and entry into the AIDS phase is very long. The incubation period averages about 9 years, while longer ones can be as long as 15 years and shorter ones as short as a few months, depending on the patient’s own physical condition and the age at which he or she becomes infected. During the incubation period, most patients have no symptoms. In the incubation period, most patients have no symptoms, but after the onset of the disease, they will have fever, night sweats, diarrhea, weight loss of more than 10%, and persistent generalized lymph node enlargement for more than one month. Opportunistic infections of multiple sites and systems throughout the body, such as pneumocystis pneumonia, cryptococcal meningitis, herpes zoster, and cytomegalovirus retinitis, may occur. Even tumors, such as malignant lymphoma, Kaposi’s sarcoma, etc., may appear.