During a gastroscopy, the doctor may take pathology based on the patient’s gastroscopy. Taking pathology means taking a small piece of mucosal tissue off the inside of the stomach and placing it under the microscope to see what changes have occurred in the cells? The most common cases are inflammatory lesions, neoplastic lesions, ulcerative lesions for biopsy, the most important pathological biopsy is to differentiate between neoplastic and non-neoplastic lesions, for epithelial origin is called lung cancer or esophageal cancer. Generally, it takes 3-5 days to get the result of pathological examination, and if the pathological examination finds doubtful or suspicious, or suspected cancer, or if the type of tumor cannot be determined, immunohistochemistry examination may be added, which will take about 5 days.