There are many reasons for a small menstrual flow and a large abdomen, such as a cold abdomen around the time of menstruation, which blocks the discharge of menstrual blood, while intestinal function is affected, causing intestinal distention and a slightly larger abdomen. In addition, gynaecological diseases, such as ovarian cysts and uterine fibroids, can also occur as described above and patients are advised to seek prompt medical attention.