would anything bad happen if we had too many of these microscopic ‘superheroes’ in our body?

Question: would anything bad happen if we had too many of these microscopic 'superheroes' in our body?
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  microbiota
Asked by scarlett to Juan on 23 Jun 2016.
- Juan Ortiz answered on 23 Jun 2016:
  
  In some diseases, like leukemia there is a big production of these “superheroes” (the leukocytes) and they are not functional. The word leukemia comes from the Greek words “leukos” that means white and “haima” that later became “hemia” that means blood. Then leukemia means “white blood”. This is a type of cancer caused by an excess of white cells in the blood.

Question: would anything bad happen if we had too many of these microscopic 'superheroes' in our body?