The transplantation here should be in vitro transplantation, in vitro transplantation on the 9th day chest suddenly not bloated may be the body to adapt, hormonal changes, transplantation failure and other reasons. 1. Body adaptation: everyone feels different after IVF, as time goes by, the body will adapt to the feeling of chest swelling, the 9th day may feel chest swelling suddenly disappeared, these are the body’s self-feeling, can’t explain what the problem is. 2. Hormonal changes: in the month of ovulation in vitro fertilization, due to the process of ovulation there is a large amount of estrogen, estrogen levels rise to stimulate the mammary glands, mammary ducts hyperplasia, dilatation, may produce the feeling of chest swelling, and so on the body after the decline of estrogen levels, the 9th day of the chest swelling feeling may disappear, the chest suddenly does not feel bloated. 3. Transplantation failure: the body has no way to secrete human chorionic gonadotropin after the failure of IVF transplantation, the lack of human chorionic gonadotropin stimulation, the feeling of chest distension may suddenly disappear, whether the transplantation has failed or not, it is necessary to judge through the examination at a later stage. Each person’s physical condition is different after IVF transplantation, and the changes and feelings of the body after transplantation are also different. There may be other reasons why the chest is not distended after IVF transplantation, so please consult the hospital in time and make positive diagnosis and treatment in order to avoid adverse consequences.