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Long COVID causes consistent long-term deterioration in physical functioning, vitality, fatigue, and respiratory distressLong COVID causes lasting decline in physical function and vitality

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Key Takeaway
Note that Long COVID is consistently associated with long-term deterioration in physical functioning and vitality.

This systematic review synthesizes evidence from 10 studies involving 1,078 patients with Long COVID and 768 healthy controls to evaluate health-related quality of life (HRQoL) and associated biomarkers. The review identifies a consistent long-term deterioration in HRQoL following COVID infection, specifically affecting physical functioning, vitality, fatigue, daily activities, pain, discomfort, and respiratory distress.

Furthermore, the synthesis indicates that lower HRQoL indicators are associated with increased neurotoxicity, decreased calcium levels, systemic inflammation, endothelial dysfunction, and signals from individual autoantibodies. However, the authors note that the specific relationship between these biomarkers and HRQoL is poorly understood and was only identified in a few studies.

Limitations include high heterogeneity of methods across the included studies. Clinical practice relevance is noted in the consistent association between Long COVID and declines in physical and functional areas, alongside strong signals regarding inflammatory processes and endothelial coagulation. Results should be interpreted with caution due to the limited number of studies establishing direct links between specific biomarkers and HRQoL outcomes.

Living with Long COVID can feel like a constant uphill battle. New research confirms that people with this condition experience a consistent decline in their quality of life over time. These issues are most noticeable in physical functioning, general vitality, and the ability to manage daily tasks.

Researchers looked at data from over 1,000 patients with Long COVID alongside nearly 800 healthy people. They found that those with the condition often struggle with persistent pain, discomfort, and respiratory distress. The study also linked lower quality of life scores to specific physical issues like inflammation and problems with blood vessel function.

While the data shows a clear link between these symptoms and underlying biological markers, it is important to note that some of these connections are still not fully understood. Because the methods used in the original studies varied widely, more research is needed to pin down exactly how these factors interact.

What this means for you:
Long COVID leads to lasting physical struggles, including fatigue, pain, and difficulty with daily activities.

Common questions

What specific symptoms are most common in Long COVID?

People with Long COVID often experience a steady decline in several areas of their lives. The most common issues include problems with physical functioning, low vitality, constant fatigue, pain, discomfort, and respiratory distress. These factors make it harder for individuals to manage their daily activities after the initial infection.

What biological factors are linked to Long COVID symptoms?

Lower quality of life scores in patients were associated with several internal markers. These include signs of systemic inflammation, issues with blood vessel function (endothelial dysfunction), and signals from autoantibodies. However, the link between these specific biomarkers and a person's quality of life is still not fully understood.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJun 2026
View Original Abstract ↓
Long COVID is known to be associated with prolonged multiple organ symptoms and decreased health-related quality of life (HRQoL), but the pathogenesis and relationship between immune, inflammatory, and metabolic biomarkers and HRQoL remains poorly understood. This systematic review aims to synthesize the evidence on the health-related quality of life of patients with Long COVID and to summarize the reported associations between health-related outcomes and biomarkers. We conducted a systematic search in PubMed, Web of Science, and Scopus in search of studies that evaluated immune, inflammatory, or metabolic biomarkers and HRQoL in patients with Long COVID. This review included case–control and cohort studies with a control group. The Rayyan tool was used to select studies, and full-text articles were evaluated for compliance with the criteria. Information was obtained on biomarkers, analytical methods, tools for assessing the HRQoL, and the relationship between HRQoL and biomarkers. Due to the high heterogeneity of the methods, the results were summarized in a descriptive form. Ten studies were included, involving 1,078 patients with Long COVID and 768 healthy controls. Most studies that used various methods to assess HRQoL consistently reported long-term deterioration after COVID, with the greatest deterioration observed in the areas of physical functioning, vitality, fatigue, daily activities, pain, discomfort, and respiratory distress. The most frequently measured markers were related to inflammation and endothelial/coagulation pathways, including CRP, hsCRP, IL-6, TNF-α, D-dimer, and VCAM-1. Autoimmune, metabolic, intestinal barrier, and omics-based markers were measured less frequently, but indicated phenotype-specific biological heterogeneity. Only a few studies have identified a direct link between biomarkers and HRQoL. Lower HRQoL indicators were associated with increased neurotoxicity, decreased calcium levels, systemic inflammation, endothelial dysfunction, and signals from individual autoantibodies. Our results indicate that Long COVID is consistently associated with a long-term decline in HRQoL, especially in the physical and functional areas. The available data indicate the presence of a strong signal regarding inflammatory processes and endothelial coagulation, while autoimmune, metabolic, and genetic data indicate phenotype-specific heterogeneity. Unique identifier: CRD420251239371, URL: https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD420251239371.
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