Large stomach in early pregnancy can be a normal phenomenon, or can be caused by pathological factors. 1. Physiological phenomenon: early pregnancy stomach is mostly associated with overnutrition, can be related to the whole body weight gain, will also show the small abdomen shows enlargement. May also be caused by mental factors, self-perception of small abdominal bulge; in the bladder is full without timely urination will also show small abdominal enlargement; may also be pregnant with multiple pregnancies, the development of multiple embryos, the uterus body enlargement and early pregnancy appears to be the stomach has enlarged. 2. Pathological factors: such as abnormal pregnancy such as hyperemesis gravidarum, the lower abdomen can be obviously bulging; women suffering from pelvic tumors such as large uterine fibroids, ovarian tumors will appear to have a large stomach, accompanied by varying degrees of discomfort or pain in the lower abdomen. If a woman’s stomach is large after the first trimester and the pregnancy week does not match, she needs to go to the hospital and be examined by a professional doctor to rule out pathological factors.