Look at who actually pays you
Before choosing a language, split last quarter's self-pay patients by the language they messaged you in. That single number settles the argument faster than any theory about the market. Most Kuwaiti clinics discover the paying majority wrote in Arabic while all their content was in English.
The exception is specialties driven by expat demand or medical travel from outside the country, where English carries the higher-value cases. There is no universal answer — there is your answer, and it is in your own inbox.
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Dialect for trust, standard Arabic for the clinical part
The register matters as much as the language. Speak the hook, the reassurance and the everyday explanation in Kuwaiti dialect — it is how a patient would hear it from a friend. Keep the clinical terms in standard Arabic so they stay precise and searchable.
What does not work is translated Arabic. A caption that reads as an English sentence rearranged in Arabic words signals that the doctor did not write it, and a patient reads that as distance. If you cannot write natural Kuwaiti Arabic yourself, have someone who can write it from a recording of you speaking, not from an English draft.
Run both without doubling the work
Film once in your natural language and burn in subtitles for the other — always proofread the medical terms manually, because auto-captions mangle them and a wrong drug name is worse than no caption. For written pages, produce the Arabic version first for your top procedures, then adapt to English rather than translating word for word.
On search, treat them as two markets. The same procedure has different phrasing, different competition and different volume in each language, and the Arabic side is usually far less contested — which is where the cheapest visibility in Kuwait still sits.