Constant vague pain in stomach for several months is not necessarily cancer. Besides stomach cancer, constant vague pain in stomach for several months may also be chronic gastritis, gastric ulcer and other diseases. 1. Gastric cancer: persistent vague pain in stomach for several months is a clinical symptom, although it can be seen in patients with gastric cancer, but it can not be diagnosed only according to clinical symptoms, gastric cancer needs to be diagnosed by perfect gastroscopy and pathologic examination. 2. Chronic gastritis: chronic gastritis can also present with persistent stomach pain, which can last for several months if not treated in time or when the treatment effect is not good, so it is necessary to improve carbon 13 breath test and gastroscopy to find out the cause of the disease and make a diagnosis. 3. Gastric ulcers: stomach ulcers can also cause vague pain in the stomach for several months, especially if the treatment is not in accordance with the standardized treatment or not enough course of medication, the ulcers often can not be completely healed resulting in the persistence of the symptoms, and need to improve the gastroscopy to clarify. Therefore, persistent pain in the stomach for several months is not necessarily cancer, but may also be chronic gastritis, gastric ulcer and other diseases, it is recommended that patients with related symptoms under the guidance of the doctor to improve gastroscopy and other related tests to clarify the diagnosis and treatment.