
"un" is not needed

I would only use "un" if I were to use an adjective or add a description of the headache afterwards.
I don't know if any native speakers would say it this way, though.

I agree with you cueyayotl.
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This sentence was initially added as a translation of sentence #280173
added by darinmex, January 21, 2011
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edited by cueyayotl, May 17, 2016
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