Heartburn, is a feeling of burning, warmth, heat, or pain that generally starts in the upper abdomen beneath the lower breastbone.
It is also known as reflux espohagitis or GERD.

Heartburn occurs when food and stomach juices back up (reflux) into the esophagus, which is the tube that leads from the throat to the stomach.

Heartburn can occur with other symptoms, such as hoarseness, a feeling that food is stuck in your throat, tightness in your throat, a hoarse voice, wheezing, asthma, dental problems, or bad breath.