A woman with a large, hard, bulging stomach should consider whether it is caused by physiological conditions such as pregnancy, but it may also be caused by pathological factors such as uterine fibroids, teratomas or colorectal malignant tumors. 1. Physiological conditions: If a woman is pregnant, the uterus gradually enlarges to a spherical shape with the progress of pregnancy, which can make the abdomen protrude, accompanied by menopause, early pregnancy reactions (such as nausea, vomiting, drowsiness, etc.), breast changes and other manifestations. 2. Uterine fibroids: if the fibroids gradually become bigger to a certain extent, the uterus can be bigger than the size of third trimester pregnancy, and a substantial mass can be touched in the abdomen. 3. Teratoma: in the early stage, it can be asymptomatic, but it can also cause abdominal distension, and a mass can be touched in the abdomen; if the teratoma grows rapidly, it can cause ascites. 4. Malignant tumor of colon: when colon cancer occurs, abdominal mass can be formed, which may be the tumor itself or the accumulation of feces in the obstructed intestinal lumen, and the mass is hard. There are many reasons why women’s abdomen becomes big, hard and bulging, it is recommended to go to the hospital for consultation, clear diagnosis and active treatment.