How long until you should see a doctor from a headache?

How long until you should see a doctor from a headache?
I have had a headache, or just some sharp shooting pains in one part of my head rather, and I was wondering: after how many days should you see a doctor? I’ve had it for 3 days now. Thank-you if you answer !

There are losts of good answers, but the best answer:

Answer by bill g
sooner rather than later — good luck

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