When this condition happens quickly, cardiac tamponade symptoms may include: Sharp pain in the chest. The pain may also radiate or extend to nearby parts of your body like your arm, back, neck or shoulder. It may also get worse when you breathe deeply, lie flat or cough. Trouble breathing or breathing rapidly. Fainting, dizziness or lightheadedness. Changes in skin color, especially pale, gray or blue-tinted skin. Heart palpitations (where you become unpleasantly aware of your heartbeat). Fast pulse. Altered mental status. A person with cardiac tamponade won’t act like themselves and may act confused or agitated. When the condition happens more slowly, you may also have these cardiac tamponade symptoms: Shortness of breath. Swelling in your abdomen or legs. Fatigue or tiredness. Chest discomfort that typically gets better when you lean forward or sit up.