Treatment: Individuals may report chest pain and the sensation of a heavy or irregular heartbeat, dizziness, fainting, anxiety, or shortness of breath. Symptoms usually begin suddenly. Current use of medications such as prescription or over-the-counter drugs, herbal products, diet pills, or illegal drugsshould be noted. Heart disease is the most common risk factor for arrhythmias. There are also certain congenital conditions that predispose a person to arrhythmias.