Some Flu Symptoms Can Persist Like Long Covid

By the Editorial Team · Monday, October 5, 2026

A recent large-scale study led by Ziyad Al-Aly found that a significant number of flu patients experience prolonged, multi-organ symptoms lasting well beyond the initial infection, a condition now being termed "long flu." This discovery highlights the need for increased flu vaccination and early treatment to prevent not only acute illness but also long-term health complications.

As the flu season arrives, health experts are drawing attention to a phenomenon known as "long flu," where symptoms persist well beyond the typical acute phase of influenza. While most people expect flu symptoms such as coughing, fever, and congestion to resolve within a few weeks, emerging research indicates that a significant subset of patients may experience prolonged health issues affecting multiple organ systems.

According to data from the United States, last year approximately 32 million people contracted influenza, resulting in nearly 400,000 hospitalizations and over 24,000 deaths. However, a large-scale study published in 2024 in the journal Lancet Infectious Diseases suggests that the impact of influenza can extend far beyond the initial illness. The research, led by Ziyad Al-Aly, a senior clinical epidemiologist at Washington University in St. Louis, revealed that many individuals face lasting complications after their flu infection subsides.

These extended symptoms, referred to as "long flu," can involve not only the respiratory system—where the influenza virus primarily attacks—but also other parts of the body, including neurological effects on the brain. The analysis found that the long-term health consequences of influenza are considerably more severe and widespread than previously recognized.

Before the COVID-19 pandemic and the widespread focus on "long COVID," both the medical community and the public largely underestimated the potential for chronic issues following a bout with the flu. Al-Aly noted that his own perceptions changed after examining post-influenza outcomes in the study’s data, describing the findings as eye-opening.

This research adds to a growing body of evidence that flu infections may trigger complex, multi-organ sequelae lasting months or longer, underscoring the importance of preventive measures such as vaccination and early treatment. Public health officials continue to emphasize flu vaccination as a critical tool to reduce not only the immediate risks of influenza but also the possibility of enduring health complications.

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