what causes an arrhythmia
What Causes an Arrhythmia? An arrhythmia can occur if the electrical signals that control the heartbeat are delayed or blocked. This can happen if the special nerve cells that produce electrical signals don't work properly. It also can happen if the electrical signals don't travel normally through the heart.
Arrhythmias are caused by: 1  Infection or fever. 2  Physical or emotional stress. 3  Diseases such as anemia or thyroid disease.  Drugs and other stimulants, such as caffeine, tobacco, alcohol, cocaine, amphetamines, and certain over-the-counter and prescription 1  medications. Your genes.  Some heart conditions.