AIDS is a disease caused by infection with the human immunodeficiency virus and is contagious. Having AIDS can lead to immune dysfunction, which can cause systemic diseases. Usually, patients can initially determine whether they have AIDS through self-testing methods such as contact history, test paper test, and their own symptoms. 1. Contact history: First, determine whether they have a history of contact with AIDS, such as a history of high-risk sexual contact, blood contact, etc. If it is an infant, the possibility of mother-to-child transmission should also be considered. 2. Test paper test: Use AIDS test paper for testing. After disinfection, take fingertip blood or earlobe blood, drop it into the test paper, add buffer solution, check the result in about 15 minutes, only one red line on the test paper is negative, two red lines are positive, no red line is a test failure, you can change the test paper and test again; 3, your own symptoms: typical symptoms of early AIDS are chills, fatigue, fever, swollen lymph nodes, cough, breathing difficulties, herpes, etc. If you suspect that you have AIDS, you can carefully observe whether you have the above symptoms. If you suspect you are infected with AIDS, it is recommended to go to a hospital for further examination, during which you should pay attention to protection and avoid close contact with others. Once AIDS is diagnosed, active treatment should be carried out under the guidance of a professional doctor.