If an AIDS patient does not take antiviral medication, the virus will continue to replicate in the body. As the virus continues to replicate, the immune system continues to be compromised and the CD4+ T lymphocyte count will gradually decline. As the CD4+ T-lymphocyte count drops to a certain level, the patient will enter the AIDS stage. During the AIDS phase, patients may develop fever, night sweats, diarrhea lasting for more than one month, weight loss of more than 10%, and various opportunistic infections such as Pneumocystis pneumonia and Cryptococcal meningitis. Tumors can also develop, such as malignant lymphoma, Kaposi’s sarcoma, etc. Therefore, AIDS patients should adhere to their antiviral medications to avoid entering the AIDS phase.