A large stomach like pregnancy before menstruation may be caused by bloating due to digestive dysfunction caused by a sudden drop in estrogen and progesterone, or a large stomach like pregnancy that has no relation to menstruation is caused by disease, common diseases include giant cysts of the ovary, ovarian cancer, tuberculosis and so on.
Women before menstruation, due to the reduced levels of progesterone and estrogen, although it will lead to the pelvic cavity and other organs in a state of congestion, but generally will not stomach particularly large.
In addition, due to the reduction of progesterone will cause a corresponding reduction in basal metabolic rate, which subsequently causes gastrointestinal peristalsis to slow down, the food remains in the digestive tract for a long time, easily causing bloating, a large stomach like pregnancy, usually poorer digestive function of women more obvious.
Before menstruation, the belly is big like pregnancy, may also have no relationship with menstruation, may be the ovaries appear larger cysts or their own obesity, may also be due to the relationship between the disease appeared a large number of ascites, such as tuberculous ascites, inflammatory ascites, etc., usually accompanied by other symptoms, such as tuberculous ascites may have a low fever in the afternoon; inflammatory ascites will be the abdominal pain and discomfort, etc..
If symptoms are relieved after menstruation, no additional treatment is needed. If the symptoms persist or continue to worsen then you need to seek medical attention, and if necessary, you can be treated with medication under the guidance of your doctor.