Can oregano oil taken internally cause erosive gastritis?

Yes, taking oregano oil internally can potentially cause erosive gastritis in some individuals. Oregano oil is highly concentrated and may irritate the stomach lining, especially when consumed in large amounts or without dilution. This irritation can lead to inflammation and erosion of the gastric mucosa, resulting in symptoms of gastritis. It's advisable to consult a healthcare professional before using oregano oil as a supplement.