Hi! An aneurysm has to be large enough to be causing headaches. Since your mother has aneurysm, yes, a MRI of brain should be done.
It is difficult to diagnose the cause of headaches on net. Sinusitis, refractive errors of the eye, migraine, cluster headaches, brain tumors, high blood pressure, tension headaches, temporal arteritis, pinched cervical spinal nerve, TMJ, poor or disturbed sleep etc are several causes of headaches. Dental pain and ear ache due to infection or impacted wax can cause similar symptoms. Needless to say, a persisting headache should be investigated. Please consult a headache and migraine specialist to rule out these causes one by one.
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