Markdown applications don’t agree on how to handle underscores in the middle of a word. For compatibility, use asterisks to bold the middle of a word for emphasis.
(note GitHub's markdown editor does not add emphasis to the middle of the example above).
When using snake case with three or more words, the inner words get converted to italic. For example, I_LIKE_CHEESE becomes ILIKECHEESE.
According to this Markdown Guide:
(note GitHub's markdown editor does not add emphasis to the middle of the example above).