Tulane University Aug 13 2025 Extreme heat can be hard on your heart. As temperatures rise, the heart pumps faster to move blood toward the skin to cool the body. This added strain on the cardiovascular system can increase the risk of heart attack or stroke, especially for those with existing heart conditions. The danger can spike dramatically when combined with high humidity, according to a new study from Tulane University that found the risk of visiting the emergency room for a heart-related