Blocked blood vessels occur from the build-up of plaque (fatty deposits) on the blood vessels' inner hollow. Such blocked blood vessels increase the risk of heart attack, stroke, and death. Some factors that increase the risk of the blood vessels getting blocked are high cholesterol, high blood pressure, diabetes, smoking, obesity, stress, and a sedentary lifestyle.
Heart Attack Explained
This article describes heart attack in simple language, which can be easily understood by common people.

Non-Atherosclerotic Occlusion - An Overview
Peripheral non-atherosclerotic arterial disorders (NAADs) refer to a diverse range of relatively uncommon ailments. Read to know more.