So heart burn's a symptom. It's basically, it is what it says. What you're feeling is a little burning sensation around in your heart. So it's in the chest area. The most common causes of heart burn are basically acid reflux. Because what you're feeling is that heat of the acid washing up from the stomach up into the esophagus. So that reflux is causing that symptom of burning sensation within your chest. And that's what really heart burn is. So anything that increases the acidity in your stomach, or anything that causes that reflux up into your chest of acid, is going to cause heart burn. Whether it's smoking, alcohol, spicy meal, a fatty meal, laying down to sleep after a big, heavy meal. All of those things that increase reflux can have the symptom of heart burn.