In the case of a sudden increase in the size of the belly, if it is accompanied by the cessation of menstruation, it is more likely that the female patient is pregnant. As the embryo grows and develops in the uterine cavity after pregnancy, it will cause an enlarged belly. A pregnancy test such as a pregnancy test or pregnancy test paper is needed to confirm the diagnosis of pregnancy. If pregnancy is ruled out, consider whether the patient has eaten too much nutritious food and absorbed these nutrients well, resulting in an overly obese body, and the clinical manifestation of an enlarged belly may also occur. Therefore, the patient’s condition needs to be clearly judged according to the patient’s specific situation.