Arrhythmias, also known as dysrhythmias, are an abnormality in the rhythm of a person's heartbeat. Synonyms for this term include heart rhythm disorders, cardiac arrhythmias, and irregular heartbeats. There are several types of arrhythmias, including atrial fibrillation, bradycardia, tachycardia, and ventricular fibrillation. These conditions can be caused by various factors, including heart disease, electrolyte imbalances, medications, and genetic disorders. Symptoms may include chest pain, dizziness, shortness of breath, and palpitations. Treatment options range from medication to cardioversion and implantable devices. It is important to seek medical attention if you suspect that you may be experiencing an arrhythmia.