When you eat or drink, the food goes from your throat to your stomach through a long pipe inside your body. This pipe is called the esophagus. It moves food and drinks down, so your stomach can break them into tiny, tiny pieces.

But sometimes, something weird happens. Tiny bugs (germs) might bother your body, or there might be too much acid in your stomach.

When that happens, the esophagus gets swollen and red. And you can feel pain or like something is burning inside you. This is called esophagitis.