There is rarely any indication that someone has been infected with HIV until a week to three weeks later. Even then the symptoms may be so few and so mild that they are passed off as cold or flu symptoms.
However, 50 percent to 70 percent of infected persons then develop acute HIV syndrome. Its symptoms usually last only about a week, and once again, could easily be those of some other infection.
The symptoms of acute HIV syndrome may include:
swollen lymph glands
joint or muscle pain
loss of appetite
nausea and vomiting
Because all of the symptoms could indicate some other ailment, the Centers for Disease Control and Prevention stress that the only way to find out whether or not you have the HIV infection is to get tested.