Heart rhythm abnormalities are known as arrhythmia. This is defined as an interruption to the natural rhythm of the heart which can make the heartbeat faster or shower than it should or with an irregular or disordered rhythm. Arrhythmias can cause no symptoms, or you may feel dizzy, short of breath, have irregular pulse or palpitations, pain, or pounding in your chest. The most common types of heart rhythm abnormalities include atrial fibrillation, atrial flutter, bradycardia, premature contractions, tachycardia, and ventricular fibrillation. Smoking, family history, diabetes, stress, high blood pressure, and obesity can increase your risk of developing a heart rhythm abnormality.