When people are infected with HIV, they may have flu-like symptoms in the early stages, including fever, sore throat, muscle aches and swollen lymph nodes, which last for 1-3 weeks and are often overlooked. As the disease becomes more intense and enters the window period, infected people can have no symptoms, and this period can last 6-8 years. As the disease progresses further, patients can show obvious signs of immune system damage after the onset of the disease, with common manifestations such as unexplained irregular fever for more than 1 month, chronic diarrhea for more than 1 month, and persistent weight loss in the recent past, as well as recurrent oral candida infections and deep fungal infections in the body, all of which represent extreme immune system The immune system is extremely compromised.