Which of the following is NOT a sign of stroke?

Headaches can occur for various reasons, including tension, migraines, or other medical conditions, and while they can accompany a stroke, they are not definitive signs of one. In a stroke, specific neurological symptoms typically present, such as facial droop, numbness, or paralysis, which result from the disruption in blood flow to the brain. These particular signs indicate an immediate neurological event and are critical in identifying a stroke quickly for timely treatment. Each of those symptoms—facial droop, numbness, and paralysis—reflects impairment of normal motor and sensory functions due to brain injury. However, a headache alone, without the accompanying neurological symptoms, does not typically indicate a stroke and can lead to misinterpretation of the condition. Therefore, identifying a headache without additional signs as not being a specific indicator of stroke is accurate in the context of understanding the condition.