"När började smärtan?"
Translation:When did the pain start?
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No, 'began' is incorrect, though i can understand why you might try that ('började' is simple past tense in Swedish).
English does not use past tense verbs in interrogative clauses that start with 'when did', so you need the simple present tense 'begin' instead of the simple past tense 'began'. I think there's a special term for this type of past tense verb phrase ('did begin'), but I don't know what it is.