When women say that their aunts are especially low, they are referring to low menstrual flow, which is usually caused by hormonal changes in the body, and may also be caused by medications. Many women will diet excessively during the weight loss period, due to insufficient food, the body of a variety of nutrients are lacking, the ovaries can not normal secretion of progesterone and estrogen, it is easy to have a low menstrual cycle. If excessive weight loss leads to a decrease in the fat content of a woman’s body, it will also cause a lack of estrogen synthesis and lead to menorrhagia. Some women take a lot of diet pills or some irregular diet pills during the period of weight loss, and the adverse effects of the drugs on the body may also lead to low menstrual flow. Women who experience a significant decrease in menstruation during weight loss should seek prompt medical attention and take regular treatment under the guidance of a doctor.