What can you tell me about Aids/HIV?

Do people know they have them can you tell if you do have them? Also, if you think you have Aids/Hiv what do you need to do to make sure?

Everything you wanted to know is found on this site:

http://www.aidsinfo.nih.gov/

I would prefer not to offer my own advice, but rather suggest that you visit websites that specialize on that subject. a couple that come to mind are WHO (World Health Organization), and the CDC (Centers for Disease Control.)

The initial stage of infection (primary infection), which occurs within weeks of acquiring the virus, is often characterized by a "flu-" or "mono-"like illness that generally resolves within weeks.
The stage of chronic asymptomatic infection (meaning a long duration of infection without symptoms) which lasts an average of 8 to10 years.
The stage of symptomatic infection, in which the body's immune (or defense) system has been suppressed and complications have developed. This stage is called the acquired immunodeficiency syndrome (AIDS). The symptoms are caused by the complications of AIDS, which include one or more unusual infections or cancers, severe loss of weight, and intellectual deterioration (called dementia).
When HIV grows (that is, by reproducing itself), it acquires the ability to change (mutate) its own structure. This mutation enables the virus to become resistant to previously effective drug therapy.
The goals of drug therapy are to prevent damage to the immune system by the HIV virus and to halt or delay the progress of the infection to symptomatic disease.