Where each register belongs
Use dialect for anything a patient would say to a friend: the opening line, the reassurance, the cost conversation, the description of how something feels. Use standard Arabic for anything they would read on a report: the name of the condition, the drug, the procedure, the anatomy.
Mixing them in one sentence is not a mistake — it is exactly how a Kuwaiti doctor speaks in the room, and writing the way you already speak is the whole technique.
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How to stop producing translated Arabic
Never write the English first. If the Arabic version starts life as a translation, it inherits English sentence structure and lands as foreign no matter how good the vocabulary is. Record yourself explaining the topic in Arabic, transcribe that, and edit lightly — the transcript is already native.
If someone else writes for you, give them a voice note rather than a brief. A writer working from a recording produces your Arabic; a writer working from an English brief produces theirs.
The details that give it away
Numbers written in the wrong numeral set for the audience. Dates in a format nobody here uses. Currency written as KWD in a sentence where a Kuwaiti would say دينار. Latin punctuation inside Arabic text. Subtitles that translate a clinical term into something no doctor would say.
None of these change the meaning and all of them signal that the content was assembled rather than spoken. In a market where trust is the entire product, that signal is expensive.