<s>[INST] What causes a stroke? [/INST] Strokes sometimes are called brain attacks because they often occur suddenly and result in loss of blood flow to the brain or bleeding into the brain that causes cells to die. Because injury that cell death causes to the brain progresses over time, it is vital to seek help immediately if someone you know is having a stroke. Source: EMORY HEALTH CARE. Link: https://www.emoryhealthcare.org/centers-programs/brain-health-center/treatments/stroke-faqs#:~:text=Am%20I%20at%20risk%20for,compelling%20reason%20to%20quit%20smoking.. Field: Neurology. Disease: Stroke </s>