👉 Periostracum is a medical condition that occurs when the lining of the stomach or small intestine becomes thickened and inflamed. This can be caused by various factors such as diet, stress, infections, or certain medications. The thickening of the lining can lead to discomfort, bloating, and abdominal pain. In some cases, periostracum may also cause changes in bowel movements, including diarrhea or constipation. Treatment for periostracum typically involves managing symptoms and