THE BEST HEART CLINICS NEAR ME Catch the signs early Heart Attack warning signs infographic thumbnailDon’t wait to get help if you experience any of these heart attack warning signs. Some heart attacks are sudden and intense. But most start slowly, with mild pain or discomfort.: Chest discomfort. Most heart attacks involve discomfort in the center of the chest that lasts more than a few minutes – or it may go away and then return. It can feel like uncomfortable pressure, squeezing, fullness or pain. Discomfort in other areas of the upper body. Symptoms can include pain or discomfort in one or both arms, the back, neck, jaw or stomach. Shortness of breath. This can occur with or without chest discomfort. Other signs. Other possible signs include breaking out in a cold sweat, nausea or lightheadedness.