The sudden disappearance of breast swelling and pain after three days after implantation may be normal, but it does not exclude pathological conditions, such as the cessation of embryonic development. 1. Normal situation: after implantation, the hormone level of the pregnant woman’s body will change, and a series of early pregnancy reactions may occur, and breast swelling and pain may also occur, but these symptoms are not specific, and the appearance and disappearance of the symptoms can not accurately reflect the development of the embryo. 2. The embryo stops developing: after the embryo stops developing, the estrogen and progesterone in the body will drop rapidly, and the breasts will be affected by estrogen and progesterone locally, and the swelling and pain may disappear. If a pregnant woman’s breast swelling and pain disappears after three days, it is recommended that she consult a doctor in time, under the guidance of the doctor, complete the relevant examinations, clarify the cause of the disease and treat the symptoms.