The bulge in the upper jaw of the mouth may be physiological, or there may be mouth ulcers, oral cancer and other diseases. 1. Physiological reasons: eating and drinking too hot food will lead to palate puckering, generally light diet, pay attention to oral hygiene, after three days or so will subside. There are also some people in the process of growth and development may appear developmental abnormalities, resulting in the symptoms of oral palate puckering, generally normal, basically will not have an impact on the body. 2. Oral ulcers: after the patient has oral ulcers, the ulcers will be aggravated due to the stimulation of the oral cavity, and may produce erosion, which may lead to the symptom of bulging in the upper jaw of the mouth after spreading. 3. Oral cancer: If oral cancer has already appeared, oral tissue lesions, congestion, edema and secretion gathering may lead to this symptom. Normally, it is necessary to observe the physical condition, and if there is obvious discomfort, it is better to actively consult the doctor.