A large abdomen may be associated with polycystic ovary syndrome (PCOS), pregnancy and abdominal tumors. 1. Polycystic Ovary Syndrome (PCOS): The presence of PCOS in a woman’s body will result in the accumulation of more fat in the abdomen, often accompanied by significant obesity or insulin resistance, which will result in an enlarged abdomen. 2. Pregnancy: a woman’s large abdomen may also be a sign of pregnancy, usually in about three months the abdomen will gradually increase or bulge. 3. Abdominal tumors: abdominal tumors are also one of the reasons for women’s abdominal size, when the tumor is large or produces ascites, it will make the body’s abdomen and other parts of the body appear more obvious changes. There may be other reasons for women’s abdominal enlargement, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.