Angina can lead to a heart attack.
In fact Angina is one of the early warning signs of heart disease which leads to heart attacks so always get treated and checked out when you experience Angina as it's very serious especially if left untreated.
Heart disease is caused by fatty build-up in your coronary arteries and is also called plaque and this plaque buildup prevents blood flow that's needed to provide oxygen to your hearts muscles.
When that happens then you can experience a heart attack which can be deadly if not treated right away.