👉 Gastritis is a condition that causes inflammation of the stomach lining. It can be caused by various factors such as stress, certain medications, and changes in your diet or lifestyle habits. In severe cases, it can lead to abdominal pain, nausea, and vomiting. Gastroesophageal reflux disease (GERD) is one common cause of gastritis. Treatment typically includes over-the-counter medications, such as proton pump inhibitors or antacids, and may involve changing the diet and lifestyle habits