What is one key symptom of a stroke?

Sudden weakness or numbness on one side of the body is a key symptom of a stroke because it is indicative of a disruption in blood flow to parts of the brain that control movement and sensation. This occurs when a blood vessel supplying blood to the brain is blocked or ruptures, leading to localized neurological deficits. Recognizing this symptom is crucial for immediate medical intervention, as timely treatment can significantly impact outcomes for stroke patients.

While other symptoms such as rapid pulse, dizziness, and persistent headache can be associated with various medical conditions, they do not specifically indicate a stroke. Sudden weakness or numbness is more directly correlated with the acute neurological changes that occur during a cerebrovascular accident. Identifying this key symptom can help EMTs and other responders to act swiftly and initiate potentially life-saving protocols.