Heartburn
When food is swallowed, a band of muscle called the esophageal sphincter relaxes in order for both fluid and food to pass through, and then tightens back. For most persons experiencing cases of angina, the esophageal sphincter weakens. When it does, the stomach acid can flow back up, which is known as acid reflux. This causes heartburn, which feels similar to indigestion but it’s not necessarily related to eating your meal.