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This will depend, heavily, on the mushroom in question, and whether the tree has a disease unrelated to the mushroom, or if the mushroom caused it. Unfortunately, your photos did not come through, so I am unable to give you a detailed diagnoses. Something like a Reishi will cause the death of a tree, where as most Oysters or Omphalotus, Chestnut mushrooms, etc, will grow on trees, but not damage them. They are only taking advantage of damaged wood.

This article will go over some of the most common mushrooms that will destroy trees:

https://www.gardeningknowhow.com/ornamental/fungus-lichen/types-of-tree-fungus.htm

This one might be useful:

https://www.gardeningknowhow.com/edible/fruits/cherry/treating-armillaria-rot-of-cherries.htm