If stress is making you pull your hair out, you might want to keep a couple of strands.

They could tell you if you’re also likely to suffer a heart attack.

A new Canadian study shows that a key biological marker for physical and psychological stress is stored in the hair and those with loads of it in their manes are far more likely to have coronary attacks.

“I believe this new biological marker will be used ... to help prevent heart attacks,” said Dr. Gideon Koren, the senior study author.

“It’s an important indication of risk,” said Koren, a toxicologist at the University of Western Ontario’s Schulich School of Medicine and Dentistry.

The study appears Friday in the journal Stress.

Koren said it has been thought intuitively that stress could contribute to heart attacks, especially in conjunction with other risk factors like high blood pressure and atherosclerosis.

But aside from self-reported psychological measures, there had been no way to gauge chronic stress levels in those who have suffered attacks.

Koren’s team looked at 56 men who had suffered heart attacks and 56 hospitalized patients who had not.