After HIV infection, the first manifestation is the absence of a particular mouth ulcer symptom. The reason for these cold-like symptoms is that the HIV virus is replicating in the body in large numbers, causing a sharp decrease in immune cells, and patients usually do not have symptoms similar to oral ulcers. If the patient really enters the stage of HIV onset, some patients can have recurrent symptoms like oral candidiasis, which may be accompanied by mouth ulcers. However, once the patient enters the HIV pathogenesis stage, the patient can be diagnosed with AIDS without the mouth ulcer.