When a patient complains that he's been ill and is suffering from a fever etc.. and the doctor wants to know the duration since the symptoms first started, what is the most natural way of asking it?

Since how many days?

or For how many days?

Please help.

Thank you


eg For how many days have you had these ssymptoms?

eg How long have you felt sick??

writingtosmsSince how many days?

No. "Since" does not work that way.

writingtosmsFor how many days?

Possible. A doctor will usually say something clearer, like "When did you first notice your symptoms?" or" How long have you been feeling unwell?"

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 Clive's reply was promoted to an answer.

Would it be OK if the doctor asked something like -

How many days has it been?


eg How many days has it been since . . . (eg since you started to feel this way?)

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