References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
In the early years of the HIV epidemic, severe cognitive problems and dementia were common. Effective antiretroviral therapy has dramatically changed that. Today, most people living with HIV maintain normal brain function throughout their lives.
Milder cognitive symptoms can still happen though, and it’s worth knowing what’s normal, what’s not, and when to ask for help.
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How Does HIV Affect the Brain?
HIV crosses into the brain early in infection. The virus doesn’t usually infect brain cells directly but causes inflammation that can affect how brain cells communicate. Long-term low-level inflammation, even on effective treatment, may contribute to subtle cognitive changes in some people.
HIV-Associated Neurocognitive Disorders (HAND)
HAND is the umbrella term for cognitive problems linked to HIV. There are three levels:
| Level | Symptoms | Impact on Daily Life |
|---|---|---|
| Asymptomatic neurocognitive impairment (ANI) | Shows up only on testing | None noticed |
| Mild neurocognitive disorder (MND) | Forgetfulness, slower thinking, concentration issues | Mild |
| HIV-associated dementia (HAD) | Severe memory loss, confusion, behavioural change | Significant — now rare with ART |
HIV-associated dementia is now rare in the UK thanks to effective treatment.
Symptoms to Watch For
- Difficulty concentrating or following conversations
- Forgetting recent events or appointments
- Trouble multitasking
- Slowed thinking or word-finding problems
- Mood changes or apathy
- Balance or coordination issues
Many of these symptoms have nothing to do with HIV. Depression, anxiety, poor sleep, alcohol and other conditions are often the cause. Your HIV team can help sort out what’s going on.
Other Causes to Consider
- Depression and anxiety — very common and often mistaken for cognitive problems
- Sleep problems — including sleep apnoea
- Alcohol and recreational drug use
- Side effects of some medications (including efavirenz in some people)
- Vitamin deficiencies — particularly B12
- Thyroid problems
- Other neurological conditions unrelated to HIV
Getting Help
If you’re worried about your memory or concentration, talk to your HIV team. They can:
- Do a brief cognitive screening test
- Check for other causes like B12 deficiency or depression
- Review your ART regimen if relevant
- Refer to a neurologist if needed
Read more: What is HIV? | HIV and the immune system
Frequently Asked Questions
Will HIV give me dementia?
Not usually. With effective treatment, HIV-associated dementia is rare. Mild cognitive changes can happen but are often linked to other factors like mood, sleep or other health conditions.
Can HIV medication cause brain fog?
Some older drugs, particularly efavirenz, have been linked to concentration and mood changes in a minority of people. Newer regimens have far fewer neurological side effects.
In most cases, yes. Starting effective treatment improves cognitive function, particularly in people who started with low CD4 counts.
Related reading
- A to Z of Sex: Sexual Health Terms Explained
- Alcohol and HIV: What You Need to Know
- Anxiety and HIV: Coping and Getting Support
- Are All STIs Curable?
- Blood Problems and HIV: Anaemia, Low Platelets and More
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
