<human>:  What is the difference between a heart attack and a stroke?
<bot>: The main difference between a heart attack and a stroke is that a heart attack is caused by a lack of blood flow to the heart, while a stroke is caused by a lack of blood flow to the brain. A heart attack can occur when a coronary artery becomes blocked, leading to a lack of oxygen and nutrients needed to keep the heart muscle alive. A stroke is caused when a blocked artery leads to a lack of oxygen and nutrient flow to the brain. Symptoms for a heart attack can include chest pain, shortness of breath and nausea, while stroke symptoms can include numbness, difficulty speaking and difficulty walking.