Yes, it is possible for frequent or severe acid reflux to cause sore patches, or lesions, in the mouth. These can occur on the gums, tongue, or palate.

Can GERD irritate the tongue?

If you have gastroesophageal reflux disease (GERD), there's a chance that stomach acid could enter your mouth. However, according to the International Foundation for Gastrointestinal Disorders, tongue and mouth irritations are among the less common symptoms of GERD.

Can acid reflux affect the mouth?

How Can Acid Reflux Affect My Oral Health? Stomach acid that travels up through the esophagus can reach your mouth where it can get on the teeth and eat away at the enamel, causing tooth erosion. It's especially an issue while sleeping when you're swallowing less often and producing less saliva.