Gastritis can present as a vague pain in the stomach. Gastric cancer is a lack of stomach function, and normal metabolism and digestion are affected. Most of the symptoms appearing in gastritis are gastrointestinal reactions such as epigastric pain, bloating, nausea and vomiting. In addition to the symptoms of gastritis, gastric cancer will also have obvious loss of appetite, especially nausea at the sight of greasy food, inability to eat, sudden and drastic weight loss and emaciation. If combined with bleeding, the patient’s stools may be tarry, and the patient’s bleeding and black stools may also be the iconic symptoms of stomach cancer. Gastric ulcer may also occur. If patients have bleeding and black stools as well as abdominal pain and emaciation, gastric cancer is considered and they should go to hospital for detailed examination.