Frequent acid reflux of the stomach may be caused by diet, gastritis, reflux esophagitis and so on. 1. Diet: If the patient consumes a lot of spicy and stimulating foods or acidic fruits, he/she may have excessive secretion of gastric acid and acid reflux. 2. Gastritis: If the patient suffers from gastritis, inflammatory lesions of the gastric mucosa may occur, which may damage the gastric mucosa and lead to excessive secretion of gastric acid and acid reflux. 3. Reflux esophagitis: Reflux esophagitis is caused by dysfunction of the lower esophageal sphincter, and the typical symptom of this disease is the phenomenon of acid reflux. If you have frequent acid reflux, you should go to the hospital for examination and prompt treatment after the cause of the disease is clarified.