Acid reflux is a common condition where stomach acid flows back into the esophagus, the tube that connects the throat to the stomach. This backward flow can cause symptoms like heartburn, a burning sensation in the chest, and regurgitation, where food or sour liquid comes back up. It often happens after eating or when lying down, making it uncomfortable for many people. Several factors can contribute to acid reflux, including certain foods, obesity, and smoking. Lifestyle changes, such as eating smaller meals and avoiding trigger foods, can help manage the symptoms. In some cases, over-the-counter medications or prescriptions may be needed to provide relief.