If a pregnant woman has pain in the upper left abdomen during pregnancy, the following reasons should be taken into account: first, gastrointestinal diseases, pregnant women have obvious early pregnancy reaction after pregnancy, or their own gastrointestinal function is not good before pregnancy, the condition may be aggravated during pregnancy, and some pregnant women will have epigastric distension and pain before or after eating; in addition, acute gastroenteritis during pregnancy, there may also be pain in the upper left abdomen; second, due to fetal With the growth and development of the fetus, the fetus gradually increases in size and squeezes the pelvic and abdominal cavities, some pregnant women may have hidden pain in the upper left abdomen; third, preterm labor, when pregnant women have preterm labor contractions, they may also manifest as pain in the upper left abdomen. So no matter which cause it is, it is recommended that you should go to the hospital in time.