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Well most of the time it is because you are in the stage of the sickness called "incubation". During this phase, in certain types of virus, including the flu, you can pass it along to others even though you don't have any symptoms yet yourself. You won't have symptoms until the virus has begun to reproduce in your cells and destroys the cells when the virus particles burst them open to release the new virus particles. That damage to your cells and the fact that your cells are busy making viruses instead of doing their normal jobs are what cause you to notice symptoms. See the related question below for more about the flu incubation periods.

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