Nausea, non-vomiting, abdominal pain with abdominal discomfort are mostly caused by diseases of the digestive system, including gastritis, gastric ulcer, pancreatic diseases and so on. 1. Gastritis: the main symptom is discomfort in the digestive system. The stomach is infected by Helicobacter pylori, unclean diet, which leads to bacterial infection. Most of them are caused by bad dietary habits. It can be treated with Helicobacter pylori killing drugs (such as clarithromycin + amoxicillin + omeprazole + bismuth potassium citrate). 2. Gastric ulcer: Gastric ulcer is an ulcer formed when the gastric mucosa is digested by its own gastric acid, and the gastric mucosa loses the protective barrier of bicarbonate, thus causing abdominal discomfort. There is abdominal pain, indigestion, loss of appetite, weight loss. Some may also be accompanied by acid reflux, nausea and belching. You can take acid-suppressing drugs such as omeprazole to protect the gastric mucosa. 3. Pancreatic disease: When acute pancreatitis strikes, it usually manifests as epigastric pain, nausea and fever. Most of them are severe pain in the left upper abdomen after overeating or eating greasy food. Ultrasound, blood and urine amylase are needed to confirm the diagnosis. If nausea, abdominal pain, abdominal discomfort occurs, you need to seek medical treatment as soon as possible to avoid delay.