Can a heart attack be caused by fright?

A heart attack is when an artery gets clogged and stops the blood.

This clog is normally like a bathroom sink that takes awhile before it gets completely clogged. Many many different things can cause the clog and/or help it get clogged quicker.

If an artery is almost clogged, a simple thing like an anxiety attack could rise the blood pressure just enough to complete the clog. So, YES it can, but it's NOT the main cause of the heart attack.