Diarrhea in the early stages of HIV is mainly a symptom that occurs when there is acute viremia after infection with HIV. The symptoms at this time can be fever and diarrhea, but diarrhea is not a necessary symptom, so the time to develop diarrhea varies widely. The shortest time can be zero, which means that there is no diarrhea, and it is possible to have no symptoms at all. In more severe cases, it is possible that the diarrhea lasts 1-3 weeks, which is considered a longer period of time, and it is not possible to exclude that the patient has an unclean diet or has a cold that causes a decrease in gastrointestinal function. Therefore, the duration of diarrhea cannot be used to determine the possibility of being infected with HIV, but only by drawing blood. The presence or absence of diarrhea can be used to determine the likelihood of infection in general, but only as a hint.