With scientific studies we have made progress in knowing how flu affects the body. Most of us have ever suffered from the disease and we know that it is not pleasant.

The flu is a viral disease, especially seasonal. Many of us have ever had it and we know how flu affects the body from experience. However, there are mechanisms that are activated against infection and that are the culprits of the symptomatology.

Classically, the signs of the flu are fever, headache, muscle aches and tiredness. When it evolves normally without complications, all of them resolve without sequelae.

But some cases of the flu are more severe. When the virus is installed in organisms weakened by immunosuppression, by extreme ages or by the presence of another underlying pathology, evolution to death is possible.

We must also be clear that, when we refer to a flu, it is not the same as colds. The cold is much milder and the consequences are minor and superficial. It is different how the flu affects the body, since the aggression is greater.

The flu virus has social effects, too. Four out of ten people with a flu picture are absent from their work during the illness and almost all of them are recruited, reducing sports and social activities.

Among the symptoms that individuals perceive, according to different surveys, the most annoying is the feeling of tiredness. Almost half of those in fluids ensure that the dormant period elapses . Although fatigue is the most noticeable and annoying, we will see that it occurs because of fever and muscle aches. Behind it is the inflammation of the tissues.

The microscopic flu process
The signs and symptoms manifested externally by the disease are the expression of how the flu affects the body microscopically. Various cellular mechanisms explain that we have fever and headache.

Once the influenza virus entered the body, you know that it has about eight hours to replicate before it is detected by the human immune system. Its entrance door is the airway and sits in epithelial cells of the lung.

By penetrating human cells, the virus appropriates the organelles of cells that produce proteins; and put those organelles to work for your benefit. In short, it takes advantage of what the host already has to multiply and survive. Subsequently, the new viral copies look for other cells to infect.

When the immune system of the human being is activated to fight the influenza virus, several reactions are triggered. These reactions will establish the known symptoms of the flu and are the explanation of how the flu affects the body.

The first thing to activate for defense are white blood cells . These cells will constitute the first line for the subsequent activation of the mediators of inflammation: cytokines.

Cytokines can be understood as small hormones that carry a message in the immune system . Its mission is to cause the activation of organs and tissues to eliminate the virus from the body as soon as possible.

The immune system stops the disease, but it is also who generates the symptoms of the flu.

How flu affects the body: fever
When talking about how the flu affects the body, we have to refer inevitably to fever. The pathology passes with fever, and is one of its characteristic signs.

Fever occurs when the hypothalamus gives the order to raise body temperature. That order is issued because the hypothalamus perceives the presence of substances that we call pyrogens. Among the pyrogenic substances, we have the components of bacteria and viruses.

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