There is no data to support how long does superficial gastritis erosion become cancerous, so it is not yet possible to tell. The full name of superficial gastritis is chronic superficial gastritis, which is mainly caused by autoimmunity decline, Helicobacter pylori infection, drugs and poisons. If the treatment is not active and does not improve the triggering factors, then superficial gastritis may develop into atrophic gastritis, intestinal epithelial hyperplasia, heterogeneous hyperplasia, or even gastric cancer. However, due to the difference in the severity of the disease, the physical condition of the individual, and the degree of treatment, it is impossible to determine the probability of cancer at present. Those who need to use medication for treatment must follow the doctor’s instructions to use medication according to the dosage, on time, and for a full course of treatment, and must not stop or reduce the dosage on their own, so as to avoid incomplete treatment. It is recommended that patients with chronic superficial gastritis should go to the hospital in time and follow the doctor’s instruction for treatment to avoid delaying the condition, aggravation of erosion or even cancer.