Sudden weight gain in women is mainly due to hormonal reasons and abnormal fat metabolism. Women’s hormones fluctuate frequently but are within the normal range. If ovarian cysts or gynecological diseases cause a large amount of hormones to be secreted, this can lead to a strong appetite and a stronger ability of the body cells to absorb fat. It is also possible that oral hormones, such as dexamethasone or methylprednisolone, etc., may cause compensatory weight gain and excessive obesity in order to treat certain diseases. There is another reason is the mistake of daily eating habits, eating a lot of fat or high-calorie sugar, so that the body cells overgrow, especially fat cells, lack of exercise, and mental stress also have a certain relationship, are the reasons for women’s weight gain.