Backflow and Heartburn

Backflow noun - A flow that returns toward its source.

Heartburn and backflow are semantically related In some cases you can use "Heartburn" instead a noun "Backflow".

Heartburn noun - A painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder.

Backflow and heartburn are semantically related in burning sensation topic. You can use "Backflow" instead a noun "Heartburn".