The pH acidity level of beer is 4.0, which is the same level as wine. Acid is formed as a result of the fermentation process.
Research studies on the effects of beer on GERD symptoms, or acid reflux disease, is decidedly mixed. A study published in "Gastroenterology" found that drinking a lot of beer had no ill effects on reflux and even slightly decreased symptoms.
However, another study published in "Alimentary Pharmacology Therapeutics" found that beer consumption increased acid reflux.
The conclusion drawn from both studies suggests that individuals with acid reflux problems should closely monitor intake of beer. If beer triggers unpleasant symptoms, drinking beer should be done in moderation or eliminated from the diet.