What are the symptoms of influenza A and B?

Feb 13, 2025 Source: Cainiu Health

Dr. Ren Yi

Introduction

Under normal circumstances, influenza A and B refer to influenza type A and type B. Symptoms of both influenza A and B include fever, headache, muscle pain, cough, and fatigue. The symptoms and underlying mechanisms of influenza A and B primarily involve the body's systemic inflammatory response triggered by the virus, damage to the respiratory and gastrointestinal mucosa, and the body's immune response.

Generally speaking, influenza A and B refer to influenza A and influenza B, respectively. Symptoms of both influenza A and B include fever, headache, muscle aches, cough, and fatigue. A detailed analysis is as follows:

1. Fever

After the influenza A or B virus invades the human body, it replicates and spreads within the respiratory epithelial cells, causing cellular damage and an inflammatory response. This inflammatory reaction triggers the body's immune mechanisms, with inflammatory mediators acting on the thermoregulatory center, resulting in fever.

2. Headache

The inflammatory response caused by infection with influenza A or B virus may affect intracranial blood vessels and nerve tissues. The effects of inflammatory mediators and viral toxins lead to vasodilation within the skull, causing headaches. Additionally, the body's stress response to the viral infection may also contribute to headache development.

3. Muscle Pain

Following infection with influenza A or B virus, the virus replicates and spreads within muscle tissues, causing damage to muscle cells and triggering an inflammatory response. At the same time, the body's immune response also induces a stress reaction in the muscle tissues, releasing inflammatory mediators and cytokines, resulting in muscle pain.

4. Cough

Influenza A or B viruses primarily infect respiratory epithelial cells, causing cell damage, inflammation, and increased mucus secretion. These factors stimulate the respiratory receptors, triggering a cough reflex. Coughing is a natural response of the body to respiratory irritation and helps maintain airway patency.

5. Fatigue

Both influenza A or B virus infection and the body's immune response consume large amounts of energy. At the same time, the inflammatory response may lead to an increased metabolic rate, further increasing energy consumption, leading to muscle weakness and fatigue, making patients feel extremely tired and weak.

The symptoms and underlying mechanisms of influenza A and B mainly involve systemic inflammatory responses triggered by the virus, damage to the respiratory and gastrointestinal mucosa, and the body's immune response. When experiencing related symptoms, timely medical attention should be sought, and treatment should follow medical advice.

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Is influenza A classified as cold-type or heat-type common cold in traditional Chinese medicine?

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How many days does it take to recover from type B influenza?

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