Gastric ulcers that become larger are not necessarily cancerous, but the possibility of cancer needs to be guarded against. If the size of ulcer is getting bigger and bigger, it may be because the cause of ulcer has not been effectively controlled, which means that the situation of gastric ulcer has become serious, and it is not necessarily the result of cancer. Cancer may be suspected in the following cases: change of pain pattern, gastric ulcer pain usually occurs 1~2 hours after meal, which is a regular pain, if the pain loses its regularity, consider the possibility of cancer; ineffective treatment of ulcers: in general, gastric ulcers can be relieved after taking medication, if the condition cannot be improved after taking medication, consider the possibility of cancer; progressive wasting: if the patient has nausea, loss of appetite, wasting, etc., consider the possibility of cancer. Progressive wasting: if the patient has nausea, loss of appetite, wasting, etc., consider the possibility of cancer. If the stomach ulcer becomes bigger, patients should go to regular hospitals for examination to get a clear diagnosis.