Which of the following is a common symptom of a stroke?

Sudden confusion or trouble speaking is indeed a common symptom of a stroke. This occurs because a stroke can affect the areas of the brain responsible for language and comprehension. When blood flow to a part of the brain is interrupted, it can lead to cognitive impairments, including difficulty understanding speech or forming words. This symptom is particularly significant as it can indicate that immediate medical attention is required. Recognizing this sign can be critical for timely intervention, which can significantly affect outcomes.

On the other hand, the other options—rapid heartbeat, increased appetite, and extreme fatigue—are not as closely associated with strokes. While a rapid heartbeat can occur due to various conditions, it is not specific to a stroke. Increased appetite is generally not linked to stroke symptoms. Extreme fatigue can be a general symptom of many medical conditions but is not a definitive indicator of a stroke. The emphasis on sudden changes in cognitive function and speech is key to identifying a stroke effectively.