Gastroscopy three months ago was normal three months later stomach cancer is possible. It may be due to misdiagnosis or gastric cancer is in early stage that gastroscopy cannot detect it. If gastric cancer is diagnosed, patients are advised to actively cooperate with doctors for treatment. The earlier the gastric cancer is cured, the higher the cure rate will be. Gastroscopy is performed by passing a thin tube equipped with a miniature camera down the patient’s throat and into the stomach to look for signs of cancer. Early gastric cancer tumors are in various forms and have no obvious features under gastroscopy, and the lesions are small and easy to be overlooked. So it is possible to have a normal gastroscopy three months ago and stomach cancer three months later. Gastric tissue biopsy is the “gold standard” of gastric cancer diagnosis, which is the accurate and effective means to diagnose gastric cancer. If you are worried about the occurrence of gastric cancer, you can usually perform gastric tissue biopsy under gastroscope to determine whether it is gastric cancer or not.