Symptoms of a Heart Attack. Blood pressure is often related to the potential for a heart attack. While some heart attacks come on suddenly, others are a far more paced affair. Most will start with mild to moderate discomfort or pain in the chest region. It often feels like squeezing pressure on the chest. Sometimes it’s just outright pain. Other symptoms could include shortness of breath, lightheadedness or sometimes nausea. Emergency help should be sought if heart attack symptoms are felt.