Headache attributed to head or neck trauma

Headache attributed to cranial or cervical vascular disorder

Headache attributed to non-vascular intracranial disorder

Headache attributed to infection

Headache attributed to substance or withdrawal

Sinus Headache

A 65-year-old patient reports a new, severe headache that began suddenly this morning. They also mention experiencing a stiff neck, a high fever, and confusion. Based on this combination of symptoms, what is the most likely characteristic of this patient's headache?

A person who rarely gets headaches experiences a sudden, severe headache accompanied by a high fever and a stiff neck. Which of the following statements best explains the nature of this headache?