The causes of gastric cancer are not yet clearly understood. However, its occurrence is associated with poor dietary habits, such as irregular eating—sometimes skipping a meal, sometimes overeating, not having meals on time—and consuming pickled food, barbecued junk food, and other unhealthy dietary practices. Additionally, smoking, alcohol consumption, infection with Helicobacter pylori, chronic gastric diseases such as atrophic gastritis, and genetic factors are all somewhat related to the development of this condition.