The type of language and word choice that best suits this audience and purpose is formal and the words that are specific to the pain should be used.
What is a formal phrase?
Less intimate than informal language is formal language. It is employed when writing for business or scholarly purposes, such as graduate school projects. Collocations, contractions, and first-character pronouns like "I" or "We" are no longer used in formal language. Greater casualness and spontaneity define casual language.
The word "formal" is used to describe something with shape or form. It is therefore far more than something that is used or done in line with laws or rituals. Activities that are formal have rules. "formal clothes" or "formal apparel" refers to a method of dressing that complies with the rules for a particular event, like a party or wedding ceremony.
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