Comprehensive PhysiologyJan 13, 2026

Aging Immune System Linked to Blood Flow Problems and Thinking Difficulties in Chronic Fatigue Syndrome

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Jan 16, 2026

Abstract

Immunosenescence may play a pivotal role in cognitive dysfunction in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).

Chronic low-grade inflammation associated with immunosenescence alters immune cell function.
Changes in immune function may affect cerebral blood flow regulation and nitric oxide production.
Impaired blood-brain barrier integrity could lead to brain hypoperfusion and oxidative stress.
These factors are linked to reduced neuronal energy metabolism and neurotransmitter imbalance.
The proposed 'immune-vascular-cognitive axis' connects peripheral immune aging to central neural dysfunction.
Therapeutic strategies such as cytokine blockade and immune modulation may address cognitive symptoms.

Simplified

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex disorder marked by persistent fatigue and cognitive impairments, often termed "brain fog." Emerging evidence suggests that immunosenescence, age- or stress-related deterioration of immune function, plays a pivotal role in the pathogenesis of cognitive dysfunction in ME/CFS. Immunosenescence induces chronic low-grade inflammation (inflammaging); alters T-, NK-, and B-cell function; and promotes the release of senescence-associated secretory phenotype (SASP) factors. These changes are proposed to cerebral blood flow (CBF) regulation, may impair endothelial nitric oxide production, and may contribute to blood-brain barrier (BBB) breakdown. Consequently, brain hypoperfusion and oxidative stress are associated with impaired neuronal energy metabolism and synaptic plasticity, particularly in memory-related networks such as the default mode and fronto-hippocampal systems. This results in reduced ATP availability, excitotoxicity, and neurotransmitter imbalance, contributing to cognitive decline. The review proposes an "immune-vascular-cognitive axis" linking peripheral immune aging to central neural dysfunction. It further highlights therapeutic strategies-such as cytokine blockade, nitric oxide enhancement, immune modulation, and acupuncture-that may ameliorate neurovascular impairments and cognitive symptoms. Understanding this integrative mechanism may offer new pathways for targeted intervention in ME/CFS.

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Aging Immune System Linked to Blood Flow Problems and Thinking Difficulties in Chronic Fatigue Syndrome

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