Tightness and pain in late pregnancy may be a physiological phenomenon, but it is also necessary to check whether there is gastroenteritis, stomach disease, appendicitis or other diseases. 1. Physiological phenomenon: with the development of the fetus in late pregnancy, the uterus will gradually increase in size, which may compress the gastrointestinal tract, causing gastrointestinal dysfunction, leading to the phenomenon of stomach tightness and slight pain. 2. Gastroenteritis: unclean diet may lead to gastroenteritis, causing bloating, abdominal pain, diarrhea and other related symptoms. 3. Stomach disorders: chronic gastritis or gastric ulcer, for example, may worsen during pregnancy, resulting in abdominal pain, bloating and other related symptoms, and may also be accompanied by acid reflux, heartburn and other discomforts. 4. Appendicitis: pregnant women with appendicitis may also experience abdominal pain, bloating, and even fever and other related symptoms. 5. Other diseases, such as colds and other related diseases can sometimes be accompanied by gastrointestinal symptoms, abdominal distension and stomach pain. There may be other related manifestations such as runny nose and sneezing. To summarize, tightness and slight pain in the stomach in late pregnancy need to go to the hospital to assess the specific situation and then targeted treatment.