Harvard Heart Letter

Ask the doctors: Can a low magnesium level cause an arrhythmia?

Richard Lee, M.D and Thomas Lee, M.D.

Q. I recently developed atrial fibrillation, and my doctor said it was because my magnesium level was low. What would cause this to happen?

A. Low magnesium levels are associated with the development of heart rhythm abnormalities, particularly atrial fibrillation. Not all doctors think of this, so it's terrific that yours did.

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »