The flu, itself, can cause inflammation in the lungs which can directly lead to death. Essentially, that inflammation reduces your bodies ability to get oxygen to the rest of your body.
Beyond that, it’s secondary infections, Sepsis, or Pneumonia, COPD, etc.. all of which are enabled by the flu affecting your bodies immune response.
So, you can die directly from inflammation to your lungs, or by a secondary cause where the Flu was a contributing factor.
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