Gastroesophageal reflux disease (GERD)
![Gastroesophageal reflux disease (GERD)](https://patient.gastro.org/wp-content/uploads/2021/09/Generic_reflux-2.jpg)
Gastroesophageal reflux disease (GERD), or just acid reflux, is when stomach acid frequently flows back into the esophagus. Heartburn is the most common symptom of GERD.
Dyspepsia
![Dyspepsia](https://patient.gastro.org/wp-content/uploads/2021/09/CGH_pt-ed_dyspepsia_2018-1024x883.jpg)
Dyspepsia, or indigestion, may cause upper abdominal pain, burning or heat, and the stomach feeling full during or after eating.