AIDS is caused by the infection of HIV, also known as human immunodeficiency virus. These early symptoms include fever, muscle pain, joint pain, sore throat, night sweats, skin rash, etc. These early symptoms will disappear after a certain period of time, usually only a few weeks, and after they disappear, the disease will have no clinical manifestation for a long time, and then after a certain period of time, usually a few years. As the virus will cause more and more damage to the body’s immunity, it will lead to the body’s immunity is getting worse and worse, and in the late stage will cause a variety of opportunistic infections and malignant tumors. The so-called opportunistic infections are those that normally do not cause disease in other people, but can cause disease in AIDS patients after infection. In addition to these opportunistic infections, there are also malignant tumors. The main reason for late stage opportunistic infections and malignant tumors is the low immune system.