It is possible to experience on and off chest discomfort that lasts for days or even weeks before an actual attack. Take note of early warning signs and symptoms including: Chest discomfort or pain that feels like pressure, squeezing or clenching, or fullness Feeling dizzy or light-headed Nausea or vomiting Pain or discomfort in the chest or upper body that may spread to the jaw or arms Prolonged and severe central chest pain (heavy and crushing sensation) Shortness of breath, which may occur on its own or with chest pain