Where does phlegm go when you swallow it?

When you swallow phlegm, it travels down your esophagus into your stomach. From there, it is mixed with stomach acids and digestive enzymes, which break it down. The components of the phlegm are then absorbed or expelled by the body through normal digestive processes. Swallowing phlegm is a common way for the body to clear mucus from the throat and respiratory system.