1. Arrhythmia: a problem with the rate or rhythm of your heartbeat. Your heart may beat too fast or too slow or with an irregular rhythm. Triggers for this could be: Caffeine, Nicotine, and other stimulants.
2. Heart attack: a medical emergency that usually occurs when a blood clot blocks blood flow to the heart. This would feel like chest pain that may feel like pressure, tightness, pain, squeezing or aching. This pains spreads to the shoulder, arm, back, neck, jaw, teeth or sometimes the upper belly.
3. Coronary artery disease: a common heart condition that occurs when the major blood vessels that supply the heart struggle to send enough blood, oxygen and nutrients to the heart muscle. Major causes for this disease are: smoking, high cholesterol, high blood pressure, lack of regular exercise, diabetes, high lipoprotein, thrombosis.