Risk factors for getting HIV include:

Symptoms related to acute HIV infection (when a person is first infected) can be similar to the flu or other viral illnesses. They include:

Many people have no symptoms when they are first infected with HIV.

Acute HIV infection (Stage 1) progresses over a few weeks to months to become chronic or asymptomatic HIV infection (Stage 2) (no symptoms). This stage can last 10 years or longer. During this period, the person might have no reason to suspect they have HIV, but they can spread the virus to others.

If they are not treated, almost all people infected with HIV will develop AIDS (Stage 3). Some people develop AIDS within a few years of infection. Others remain completely healthy after 10 or even 20 years (called long-term nonprogressors).

People with AIDS have had their immune system damaged by HIV. They are at very high risk of getting infections that are uncommon in people with a healthy immune system. These infections are called opportunistic infections and can affect any part of the body. These can be caused by:

People with AIDS are also at higher risk for certain cancers, especially lymphomas and a skin cancer called Kaposi sarcoma.

Symptoms depend on the particular infection and which part of the body is infected.

Lung infections are common in AIDS and often cause cough, fever, and shortness of breath.

Intestinal infections are also common and can cause:

Other common symptoms in people with HIV infection and AIDS include:

There are tests that are done to check if you've been infected with the virus.

DIAGNOSTIC TESTS

In general, testing is a 2-step process:

Home tests are available to test for HIV. If you plan to use one, check to make sure it is approved by the FDA. Follow instructions on the packaging to ensure the results are as accurate as possible.

The Centers for Disease Control and Prevention (CDC) recommends that everyone ages 15 to 65 have a screening test for HIV. People with risky behaviors should be tested regularly. Pregnant women should also have a screening test.

TESTS AFTER BEING DIAGNOSED WITH HIV

People with AIDS should have regular blood tests to check their CD4 cell count:

Other tests include: