1, long-term: because the ulcer can heal on its own after the occurrence, but every healing and good recurrence, so often have the characteristics of long-term recurrent epigastric pain. The average duration of the disease 6 to 7 years, some can be as long as one or two decades, or even longer. 2, periodic: epigastric pain is repeated periodic episodes, is one of the characteristics of such ulcers, especially the duodenal ulcer is more prominent. Epigastric pain episodes can last a few days, weeks or longer, followed by a longer period of relief. Episodes can occur throughout the year, but are more common in the spring and fall. 3. Rhythmicity: The relationship between ulcer pain and diet has a clear correlation and rhythmicity. During the day, the period from 3:00 a.m. to breakfast has the lowest secretion of gastric acid, so pain rarely occurs during this time. The pain of duodenal ulcers occurs between meals and continues unabated until the next meal or after taking acid-control drugs. In some patients with duodenal ulcers, pain can occur in the middle of the night due to higher gastric acid at night, especially in those who have eaten before going to bed. The occurrence of gastric ulcer pain is more irregular, often occurring within one hour after a meal, gradually relieved after one to two hours, until the next meal after eating and then reappear the above rhythm. 4, pain location: duodenal ulcer pain mostly occurs in the upper middle abdomen, or above the umbilicus, or to the right above the umbilicus; gastric ulcer pain is also mostly in the upper middle abdomen, but slightly higher, or to the left under the saber and under the saber. The pain is about several centimeters in diameter in size. Because the localization of pain in the cavernous viscera on the body surface is generally not very precise, the location of the pain does not necessarily reflect the anatomical location of the ulcer accurately. 5, the nature of pain: more dull pain, burning pain or hunger-like pain, generally light and tolerable, persistent severe pain suggests ulcer penetration or perforation. 6.Influencing factors: Pain is often triggered or aggravated by mental stimulation, excessive fatigue, careless diet, drugs, climate change and other factors; it can be reduced or relieved by rest, eating, taking acid medication, pressing the painful area with hands, vomiting and other methods.