Acid reflux occurs when stomach acid flows back into the esophagus, the tube that connects the throat to the stomach. This backflow can cause a burning sensation in the chest, often referred to as heartburn. It may also lead to a sour taste in the mouth and difficulty swallowing. Several factors can contribute to acid reflux, including certain foods, obesity, and smoking. Common triggers include spicy foods, citrus fruits, and chocolate. Managing these triggers and making lifestyle changes can help reduce symptoms and improve overall comfort. If symptoms persist, it's important to consult a healthcare professional for advice.