Why is the H1N1 flu more severe in individuals who are otherwise healthier?

May 08, 2025 Source: Cainiu Health

Dr. Ren Yi

Introduction

Under normal circumstances, "Jia Liu" refers to Influenza A. Having Influenza A does not necessarily mean that the healthier a person is, the more severe the illness will be. The severity of Influenza A is related to the patient's own immunity. For most healthy individuals with normal immune systems, their immune systems can effectively respond to the viral infection, thereby limiting the progression of the disease.

Generally speaking, "swine flu" refers to influenza A. There is no evidence suggesting that having stronger physical health leads to more severe illness when infected with influenza A. Whether a person with good physical condition experiences severe symptoms after contracting influenza A varies from individual to individual. Detailed explanation is as follows:

The severity of influenza A is somewhat related to the patient's own immunity. For most healthy individuals with normal immune systems, their immune systems can effectively respond to viral infection, thereby limiting the progression of the illness. Therefore, these individuals may only experience mild symptoms, such as runny nose and fatigue, or even no obvious discomfort.

However, for some individuals with better physical condition, their immune systems are usually more active. When the influenza A virus invades, these active immune systems may mount a stronger response, attempting to rapidly eliminate the virus. However, this strong immune response can sometimes lead to excessive release of cytokines, triggering a severe inflammatory reaction. This may cause symptoms such as high fever and generalized muscle pain to worsen. Thus, in some cases, individuals who are otherwise physically healthy may experience more severe symptoms of influenza A than average individuals, although this also varies from person to person.

In daily life, maintaining a balanced diet, engaging in moderate exercise, and ensuring adequate sleep can help strengthen the immune system and improve resistance to viral infections.

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Is dizziness after influenza A a sign of recovery?

Under normal circumstances, "Jia Liu" refers to Influenza A H1N1. Whether dizziness following Influenza A H1N1 indicates recovery depends on the specific circumstances. If dizziness is the only symptom present without other accompanying symptoms, it usually suggests the condition is improving. However, if dizziness is accompanied by other systemic symptoms such as headache, tinnitus, or fatigue, it may not indicate improvement. If any discomfort persists, prompt medical attention is recommended.

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How is influenza classified?

Influenza can generally be classified into types such as influenza A, influenza B, influenza C, simple-type influenza, and pneumonia-type influenza. Influenza A: caused by the influenza A virus, which is prone to mutation and can lead to global pandemics. Symptoms are usually severe, characterized by high fever, headache, and muscle aches, and some patients may develop complications.

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How is influenza A transmitted?

In general, influenza A is mainly transmitted through respiratory droplets, close contact, airborne aerosols, contact with contaminated objects, and mother-to-child transmission. It is recommended to take proper personal protective measures in daily life, wear masks correctly when going out, and avoid crowded places. Wash hands frequently with soap or handwash and running water.

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What medication can be taken to prevent H1N1 flu in advance?

In general, influenza A can be prevented through vaccination and the use of antiviral medications. Drugs used for prophylaxis should be taken under medical supervision and commonly include oseltamivir phosphate capsules, zanamivir inhalation powder, peramivir chloride injection, baloxavir marboxil tablets, and Lianhua Qingwen capsules. It is also important to maintain good daily habits, such as frequent handwashing.