Symptoms and clinical manifestations of AIDS vary at different stages of development. The clinical manifestations of AIDS in the late stage vary. AIDS patients are prone to opportunistic infections, which mainly include gram-positive or negative bacilli, tuberculosis infections, Pneumocystis carinii, Toxoplasma gondii, as well as fungal infections, and so on. Patients with AIDS are also prone to various malignant tumors, such as Kaposi’s sarcoma and lymphoma. As well as being susceptible to dementia and wasting syndrome, which can occur as brain cells are also damaged by HIV. Wasting syndrome is characterized by significant weight loss, and the first symptoms may include transient memory loss, occasional confusion, or behavioral changes. As the disease progresses, full-blown dementia, loss of consciousness, and urinary and fecal incontinence may occur.