Atrophic gastritis can have diarrhea, but diarrhea can also be seen in many cases, such as improper diet, cold, and digestive diseases, such as acute gastroenteritis and intestinal tumors. Atrophic gastritis is a chronic inflammation of the gastric mucosa characterized by a reduction or atrophy of the intrinsic glands on the surface of the gastric mucosa, with or without gastric glandular intestinal epithelial hyperplasia. Commonly used gastric mucosa inherent gland atrophy, gastric mucosa thinning, resulting in the lack of gastric acid, pepsin, leading to digestive dysfunction, many foods can not be fully digested and absorbed, diarrhea can occur. Diarrhea can also be seen in many cases. Physiological causes include eating too much cold and irritating food and getting cold; it can also be seen in many digestive diseases, such as acute gastroenteritis, inflammatory bowel disease, irritable bowel syndrome, intestinal tumors, and chronic pancreatitis. If you have diarrhea or any uncomfortable symptoms should go to the hospital, under the guidance of the doctor to identify the cause, according to the cause of treatment.