HIV-Associated Neurocognitive
Disorder (HAND)

The CNS Reservoir — Why the Brain Is Different

The brain is protected by the blood-brain barrier — a tightly regulated interface that controls what substances can pass from the bloodstream into the central nervous system. This barrier is also a shield for HIV: many antiretroviral medications penetrate it poorly, meaning that even when viral load in the blood is undetectable, HIV can replicate at low levels within the CNS.

HIV infects microglia and macrophages — immune cells that reside in the brain — and uses them as a reservoir. These infected cells release inflammatory cytokines and neurotoxic proteins that damage neurons and disrupt neural circuits even when the virus itself is suppressed in blood3. The result is chronic neuroinflammation that continues long after viral suppression is achieved in the periphery.

This is why HAND is not fully explained by blood viral load, and why achieving undetectable status — while the most important intervention — does not guarantee cognitive preservation.

Common Symptoms of HAND in the ART Era

• Processing speed slowing: Thinking feels slower than it used to — taking longer to follow conversations, slower to respond, difficulty keeping up with fast-moving discussions
• Memory difficulties: Forgetting recent conversations, appointments, or where things were put — short-term memory more affected than long-term
• Word-finding difficulties: Losing words mid-sentence, knowing what you want to say but being unable to retrieve the word — sometimes called "tip of the tongue" phenomenon happening more frequently
• Executive function changes: Difficulty planning, organizing, multitasking, or managing complex tasks like finances, scheduling, or problem-solving
• Attention and concentration: Difficulty sustaining focus, being easily distracted, losing track in conversations or while reading
• Motor slowing: Subtle changes in coordination, handwriting, or fine motor tasks — sometimes noticed by others before the person themselves
• Behavioral and mood changes: Apathy, irritability, depression, or personality changes that seem out of character — these can be neurological rather than purely psychological

The Diagnostic Process

• Raise it with your HIV provider: Start the conversation. Describe specific examples of what you're experiencing — not just "my memory is bad" but "I lost a word I know in the middle of a meeting" or "I've been paying the same bill twice because I can't track it." Specifics matter.
• Rule out other causes first: Your provider should check thyroid function, B12 and folate, complete metabolic panel, lipid panel, HbA1c, and screen for depression before attributing symptoms to HAND. Treatable conditions that mimic HAND must be excluded.
• Referral to neuropsychology: Formal neuropsychological testing is the standard for HAND diagnosis. Ask for a referral to a neuropsychologist — ideally one with HIV experience. Testing typically takes 2–4 hours and provides a detailed profile of cognitive strengths and weaknesses.
• Brain MRI: Neuroimaging can identify structural brain changes associated with HIV — white matter abnormalities, brain atrophy, or other findings. An MRI is often part of the workup for new cognitive symptoms in PLHIV.
• CSF analysis: In some cases — particularly when CNS viral replication is suspected — a lumbar puncture (spinal tap) to analyze cerebrospinal fluid may be warranted. CSF viral load can be detectable even when blood viral load is undetectable.

Evidence-Based Approaches to HAND Management

• ART optimization — CNS penetration effectiveness (CPE): Not all antiretrovirals penetrate the blood-brain barrier equally. The CPE score is a ranking system for ART drugs based on their CNS penetration4. If CNS HIV replication is suspected, switching to a regimen with higher CPE scores — in consultation with your HIV provider and ideally an HIV neurologist — may be beneficial. This is a nuanced clinical decision that requires expert guidance.
• Aggressive management of cardiovascular risk factors: Blood pressure control, cholesterol management, diabetes management, and smoking cessation all protect brain health and have evidence in slowing cognitive decline in the general population. In PLHIV, these risk factors compound HIV-related neuroinflammation — managing them is a direct intervention for brain health.
• Treatment of depression: Depression both mimics and worsens HAND. Effective depression treatment — medication, therapy, or both — can produce significant apparent improvement in cognitive symptoms, and distinguishes depression-driven cognitive impairment from HIV-driven impairment.
• Cognitive rehabilitation: Structured programs that train attention, memory, and executive function — developed in rehabilitation medicine — have shown benefit in PLHIV with HAND in several studies7. Ask your neuropsychologist about referral to cognitive rehabilitation.
• Exercise: Aerobic exercise has the strongest evidence of any lifestyle intervention for protecting and improving cognitive function — in the general population and specifically in PLHIV. Even modest increases in aerobic activity have measurable effects on brain health markers.
• Sleep treatment: Poor sleep worsens cognitive performance significantly. PLHIV have high rates of sleep disorders including insomnia and sleep apnea — both of which impair the memory consolidation and neural repair that occurs during sleep. See our HIV & Sleep article for more.

Practical Compensatory Strategies

• Externalize memory: Stop relying on internal memory for things that can be written down or tracked digitally. Calendar everything. Use reminders. Keep a notebook. The goal is to reduce the cognitive load on a system that is working harder than it should have to.
• Reduce multitasking: Multitasking is a myth for most people — and it is particularly costly for people with processing speed and attention difficulties. Single-task where possible. Close browser tabs. Put the phone down during conversations.
• Structure and routine: Predictable daily routines reduce the cognitive demand of decision-making and planning. The more that can be made automatic, the more cognitive resources are available for things that actually require them.
• Communicate with your workplace: If HAND is affecting your work, reasonable accommodations under the ADA may be available — extended deadlines, written rather than verbal instructions, reduced multitasking demands. See our HIV & Disability article for more on workplace rights.
• Simplify medication regimens: If you are on a complex medication schedule, cognitive impairment makes adherence harder — and missed ART doses worsen HAND. Discuss simplification to a once-daily single-tablet regimen with your provider if adherence is being affected.
• Tell people close to you: HAND symptoms can be misinterpreted by family, friends, and colleagues as inattentiveness, rudeness, or disengagement. Explaining what is happening — to the people you trust — can reduce interpersonal friction and build support.