HIV symptoms
The early signs, the three stages, and when to test after possible exposure.
HIV symptoms vary widely from person to person. Some people develop a flu-like illness 2 to 4 weeks after possible exposure. Others have no noticeable symptoms for years. The only way to know your HIV status is to test.¹ ²
How HIV symptoms work
After HIV enters the body, it begins to multiply rapidly in the first few weeks. During this period — called acute infection — about half to two-thirds of people develop a flu-like illness as the immune system responds to the virus.¹ ³ Symptoms typically appear 2 to 4 weeks after exposure and last between a few days and a few weeks.
After this initial period, HIV enters a longer phase called clinical latency, during which there may be no obvious symptoms at all. This phase can last for years. Without treatment, HIV gradually weakens the immune system, eventually leading to the most advanced stage (AIDS) where the body becomes vulnerable to opportunistic infections and certain cancers.²
Modern HIV treatment is highly effective. People diagnosed with HIV today, who start treatment promptly and reach an undetectable viral load, can live long, healthy lives and cannot transmit HIV sexually.⁶ ⁷ This is known as U=U (Undetectable = Untransmittable).
The three stages of HIV
Without treatment, HIV typically progresses through three stages. Modern antiretroviral therapy stops this progression. Most people on treatment never reach the later stages.
Acute HIV infection
2–4 weeks after exposure
About half to two-thirds of people develop a flu-like illness during acute infection.¹ ³ The body is producing antibodies to HIV, but these may not yet be detectable on a self-test (window period: 21–84 days⁵). Viral load is very high during this stage, which means the risk of onward transmission is also high.
Common symptoms
- Fever (often 38°C or higher)
- Fatigue and feeling generally unwell
- Sore throat
- Swollen lymph nodes (often in the neck)
- Body rash (frequently on the trunk)
- Muscle and joint aches
- Headache
- Mouth ulcers
Clinical latency
Years (typically 8–10 years without treatment)
After the acute phase, HIV enters a long period during which there may be no obvious symptoms. The virus is still active, slowly damaging the immune system, but a person may feel and look completely healthy. This is why testing matters — symptoms cannot be relied on during this stage. With effective treatment, people remain in this stage indefinitely (without progressing to AIDS) and can live a normal life span.
Common symptoms
- Often no symptoms at all
- Some people experience occasional fatigue or low-grade fever
- Mild swollen lymph nodes (sometimes persistent)
- Skin or oral conditions (occasional)
AIDS (advanced HIV)
Without treatment
AIDS is the most advanced stage of HIV infection, when the immune system has been severely damaged. This stage is now uncommon in countries with widespread access to HIV treatment, because effective therapy prevents progression. AIDS is defined by either a CD4 count below 200 cells/mm³ or the development of certain serious opportunistic infections.²
Common symptoms
- Rapid weight loss
- Recurring fever or night sweats
- Extreme tiredness
- Persistent diarrhoea (over a week)
- Sores in mouth, anus, or genitals
- Pneumonia or other opportunistic infections
- Memory loss, depression, or neurological symptoms
- Red, brown, pink, or purplish blotches on or under the skin
When you should test
Testing is the only way to know your HIV status. If any of the following apply to you, testing is the responsible next step:
- You had unprotected sex (vaginal, anal, or oral) with a partner whose HIV status you do not know
- You shared injection equipment with another person
- You experienced sexual assault
- A current or recent partner has been diagnosed with HIV
- You have any of the symptoms described above and have had a possible exposure in the past few weeks
- You are routinely tested as part of sexual health care (annually for sexually active adults; more frequently for higher-exposure groups)
The window period for antibody-based self-tests is 21 to 84 days after possible exposure.⁵ Testing too early may give a false negative because antibodies have not yet developed.
For step-by-step guidance on what kind of test to take and when, see our HIV Testing Guide.
Read the HIV Testing Guide →What if you have symptoms but a non-reactive test?
This is a common and important question. A non-reactive self-test means no HIV antibodies were detected at the time of testing. However, antibodies take time to develop after exposure — typically 21 to 84 days⁵ — and a test taken during this window period may give a false negative.
If you have symptoms that could be HIV and have had a possible exposure within the past three months:
- Retest after 84 days (12 weeks) from the possible exposure to be certain
- Consider laboratory testing through a healthcare provider, which can detect HIV earlier than antibody-based self-tests
- Most flu-like illnesses are not HIV — but persistent or unusual symptoms in the context of a recent exposure should be discussed with a healthcare provider
Most non-reactive results are accurate. Testing within the recommended window period and retesting if your situation calls for it gives you the highest level of certainty.
A note on modern HIV outcomes
HIV today is a manageable, long-term condition. People diagnosed with HIV who start treatment promptly and stay on it can live full, healthy lives — with life expectancy comparable to people without HIV.⁶ ⁷
A person on effective treatment whose viral load is undetectable cannot transmit HIV to a sexual partner. This is known as U=U (Undetectable = Untransmittable) and is supported by large multi-year clinical studies.⁶ ⁷
For people who are concerned about a possible exposure, testing is the gateway to information, peace of mind if non-reactive, or — if reactive — to early treatment and the prospect of a healthy life with HIV.