Don't wait! Don't wait for the symptoms of HIV to show up - get tested if you could be at risk (risk factors: unprotected sex, needle sharing). A few weeks after contracting the virus, HIV causes a flu-like syndrome (fevers, malaise). Then the virus can lie dormant for years before causing life-threatening infections of the lung, brain, and other organs due to the body's damaged and decreased immunity.
Hiv. Generally, people are unaware of this because there are no symptoms until one's immune system is sufficiently impaired. That's why it's important to be screened for this even if you don't have symptoms. There is a condition called acute HIV that occurs shortly after contracting the infection, but this is often ignored since many of the symptoms are flu-like.