There are two types of GERD:
Non-erosive reflux disease - This is a type of GERD that consists of acid reflux symptoms that happen in the absence of damage to the esophageal lining. Patients who are affected by this type of GERD are generally less responsive to PPI medications.
Erosive reflux disease - Unlike non-erosive reflux disease, this type of GERD is characterized by inflammation, swelling, and ulcerations of the esophageal lining. This type of GERD is diagnosed easily, even when it shows no symptoms.