Symptoms such as dizziness and nausea are not directly related to AIDS, and AIDS is generally not considered in such cases. Instead, conditions like insufficient blood supply to the neck or brain, which might cause dizziness and nausea, are considered. The diagnosis of AIDS must rely on laboratory tests because AIDS is an autoimmune deficiency disease, and various symptoms may occur. The most common and likely symptoms of AIDS are prolonged fever and diarrhea, but these symptoms cannot be used as the basis for diagnosis; they are only auxiliary. Therefore, to confirm AIDS, one must undergo laboratory testing at an accredited hospital.