Which of the following is a "red flag" regarding patients presenting with headache?

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A unilateral headache is often seen with migraines and may commonly be accompanied by phonophobia and photophobia. Pain over the sinuses from sinus congestion may also be unilateral and produce pain. Migraine and sinus headaches are common and generally benign. A new severe headache in someone over 50 can be associated with more serious etiologies for headache. Other red flags include acute onset, "the worst headache of my life"; very high blood pressure; rash or signs of infection; known presence of cancer, HIV, or pregnancy; vomiting; recent head trauma; and persistent neurologic problems.

Which of the Following Is a "Red Flag" Regarding Patients