A biopsy is recommended for the presence of erosion in the stomach. The appearance of erosion in the stomach may be caused by diseases such as erosive gastritis and stomach cancer. A biopsy can clarify the nature of the patient’s lesion and help the doctor to better formulate a treatment plan to avoid delaying the condition. During the examination, the doctor passes a thin tube equipped with a miniature camera down the patient’s throat and into the stomach to look for signs of cancer. If any suspicious areas are found, the doctor collects a piece of tissue for analysis. In addition, if there is any abnormality in the biopsy test, it is recommended that the patient go to the hospital in time to have the relevant tests done, clarify the cause of the disease and then follow the doctor’s instructions for treatment to avoid delaying the condition.