When a patient is newly infected with HIV, symptoms will manifest and these symptoms will occur in about half or more of people with HIV. Patients will experience flu-like symptoms for about a month, but these symptoms can slowly resolve on their own, even without treatment, after a month or so. Common symptoms include headache, fever, fatigue, sore throat, diarrhea, swollen lymph nodes, and in some cases, more serious conditions such as encephalitis or other organ infections. There are also many patients who do not have any of these symptoms after HIV infection. Therefore, if a patient is considering that he or she is infected with HIV, he or she should not judge by external clinical symptoms alone, but by a formal HIV antibody blood test.