In this video, Dr. Sanjay Gupta, cardiologist at York ( talks about an unusual but not uncommon form of angina called Variant angina or Coronary artery spasm.

Coronary artery spasm tends to affect people at rest more than on exercise, Asians more than Europeans and is prevalent at ages between 40-70 years. Various triggers include magnesium deficiency and Stress. Beta-blockers can actually worsen spasm.