Nikhil Prasad Fact checked by:Thailand Medical News Team Apr 17, 2026 1 hour, 29 minutes ago
Medical News: A new study is shedding light on why some people continue to suffer lingering symptoms months after recovering from COVID-19, even when their initial illness was mild. Researchers have found that higher viral load during the early phase of infection, along with ongoing inflammation in the body, may play a key role in driving long-term neurological and muscle-related complications.
Persistent inflammation and high early viral load may drive long COVID brain and muscle problems
Long COVID Still Affecting Majority Months Later
The research followed 300 adults who had previously experienced mild COVID-19 and assessed them nearly ten months after infection. Surprisingly, 59 percent of participants were still experiencing symptoms consistent with Long COVID. These included issues such as memory problems, fatigue, muscle pain, and difficulty concentrating.
Neuropsychiatric symptoms were the most common, affecting 35 percent of participants, while musculoskeletal complaints such as weakness and joint pain affected over 32 percent. Respiratory symptoms were less frequent but still present in a notable portion of individuals.
Inflammation And Blood Changes Stand Out
One of the most striking findings was the presence of persistent inflammation long after the virus had cleared. Blood tests revealed elevated levels of key inflammatory markers such as interleukin-6 (IL-6) and ferritin in those with Long COVID.
At the same time, important blood components like hemoglobin and red blood cell counts were lower in affected individuals. This suggests that even mild infections may leave behind subtle but lasting changes in the body’s oxygen transport and immune systems.
Participants with Long COVID also showed higher white blood cell counts, particularly lymphocytes, indicating ongoing immune activation.
Vitamin Deficiencies Add to The Problem
Another important discovery was the role of micronutrients. Individuals suffering from Long COVID had significantly lower levels of vitamin D and vitamin B12. Vitamin D deficiency, in particular, was strongly linked to both neurological symptoms such as brain fog and physical issues like muscle weakness.
These deficiencies may worsen inflammation and impair the body’s ability to recover fully, potentially prolonging symptoms for months.
Viral Load During Infection Matters
The study also found a clear connection between how much virus a person carried during their initial infection and their risk of long-term complications. Individuals with higher viral loads were far more likely to develop neuropsychiatric and musculoskeletal symptoms later on.
This
Medical News report highlights that those with the highest viral burden were significantly more likely to experience persistent brain-related symptoms such as confusion and memory problems, as well as ongoing muscle pain and f
atigue.
How The Study Was Conducted
The research was carried out by scientists from multiple institutions including the Department of Physiology, Dow University of Health Sciences, Karachi, Pakistan; Department of Medicine, Indus Medical College Hospital, Tando Mohammad Khan, Pakistan; Sindh Infectious Diseases Hospital and Research Center, Dow University of Health Sciences, Karachi, Pakistan; Dow International Medical College, Dow University of Health Sciences, Karachi, Pakistan; Bilawal Medical College, Liaquat University of Medical and Health Sciences, Jamshoro, Pakistan; and Fauji Foundation Hospital, Rawalpindi, Pakistan.
What This Means for Patients
The findings suggest that Long COVID is not just a lingering inconvenience but may involve measurable biological changes that persist for many months. The combination of inflammation, immune system imbalance, and nutrient deficiencies appears to create a complex condition affecting multiple organs.
Conclusion
Overall, the study provides strong evidence that Long COVID is driven by a combination of factors including high initial viral load, persistent inflammation, and deficiencies in essential nutrients like vitamin D. These findings emphasize the importance of long-term monitoring even after mild COVID-19 infections, as many patients may continue to experience hidden biological changes despite appearing clinically recovered. Addressing inflammation and correcting nutrient imbalances could become key strategies in managing and potentially reducing the burden of Long COVID symptoms in the future.
The study findings were published in the peer reviewed journal: PLOS One
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0346978
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Medical News.
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