The common causes of death due to AIDS are mainly severe opportunistic infections, extreme wasting, extremely malignant signs, and opportunistic tumors. In the late stage of AIDS, the body’s immunity is extremely low and the body’s CD4 cells are extremely low, which makes it easy to combine many opportunistic infections, such as common bacterial, fungal, and viral infections, or to mix different kinds of viral and bacterial infections. Common opportunistic infections include Pneumocystis pneumonia, fungal pneumonia, cryptococcal meningitis and severe lymphoma, Kaposi’s sarcoma, and other opportunistic tumors, and also severe malnutrition, and later AIDS encephalopathy, which can easily lead to death if the body does not receive timely anti-HIV treatment and the immunity is not boosted in time.