Acid reflux, heartburn and unformed stools are mostly considered as gastroenteritis, digestive tract tumor and other diseases. 1. Gastroenteritis: when patients consume unclean, spicy, cold and other irritating food, which leads to the damage of gastrointestinal mucosa, excessive secretion of gastric acid directly stimulates gastric mucosa and causes acid reflux and heartburn, and a large number of inflammatory cells stimulate the intestinal wall, which will lead to unshaped stools. 2. Tumor of digestive tract: When patients have gastric cancer, the cancer cells damage the gastric mucosa, causing gastric acid secretion, indigestion of too much food, severe acid reflux, heartburn and other discomforts, and the broken surface of the tumor will also cause the symptom of unshapely stools. When patients have esophageal cancer or intestinal cancer, they will also have acid reflux, heartburn and unshaped stools. In addition, there may be other reasons for acid reflux, heartburn and unshapely stool, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment under the guidance of the doctor.