👉 In medical terminology, a paroxysmal episode is an abnormal or sudden increase in activity that occurs at regular intervals. This can include symptoms such as frequent urination, increased heart rate, and excessive sweating, which are often accompanied by other symptoms like nausea or vomiting, altered mental status, or difficulty breathing. Paroxysms of the heart are a type of arrhythmia. They occur when the electrical activity in the heart's ventricles (the chambers that pump blood) does not