There is no “most obvious symptom” during the window period of AIDS in men, but rather a series of symptoms similar to the flu, which are more common. AIDS is caused by infection with the HIV virus, and the most common ways of transmission for men with AIDS are through male-to-male sexual contact, injecting drug use, and blood transmission. The AIDS window period is the period of time between infection with the HIV virus and the detection of markers. During the window period, some patients may have no symptoms, and most may have mild symptoms, similar to those of a cold. Typical symptoms are the development of fever, which may be accompanied by weakness in the limbs, sore throat, nausea and vomiting, rash, diarrhea, dizziness and headache, and swollen and painful lymph nodes. Since the symptoms of men at this stage are not specific, you can’t rely on a certain symptom to determine whether you have AIDS or not, and if you have a high-risk sex life, you should consult a doctor in time for a scientific diagnosis.