Identify one common sign of a stroke.

One common sign of a stroke is sudden face drooping. This symptom arises because a stroke can weaken or paralyze the muscles on one side of the face. This is often a noticeable and alarming sign, where the individual's smile may appear uneven or one side of the face may droop when asked to smile. Recognizing this sign promptly is critical because it can help speed up the response time for medical treatment, which is crucial for minimizing potential long-term effects of the stroke.

The other options, while they can indicate various medical conditions, do not specifically correlate with a stroke in the same way. A sudden headache can occur with other health issues such as migraines or tension headaches. Sudden increased appetite is not typically associated with strokes and does not reflect the urgency of neurological decline. Finally, a sudden change in voice can occur in various scenarios but lacks the specificity to facial paralysis that is characteristic of a stroke. Therefore, sudden face drooping stands out as a key indicator warranting immediate medical attention.