Chest swelling in early pregnancy will disappear in a few days, which may be normal, or it may be related to abnormalities such as miscarriage with precursor, fetal arrest, and so on. 1. Normal situation: the level of estrogen and progesterone in the body will gradually increase in the early stage of pregnancy, resulting in the gradual proliferation and expansion of breast follicles and ducts, chest swelling, but the hormone level will gradually stabilize, chest swelling symptoms will gradually ease, mostly normal phenomenon. 2. Pre-eclampsia: If the embryo is not very stable in the early stage of pregnancy, and if the pregnant woman suffers from pre-eclampsia due to adverse effects, in addition to abdominal pain, abnormal vaginal bleeding and other symptoms, hormone levels will also decline, resulting in chest swelling in early pregnancy for a few days to disappear. 3. Fetal termination: when the embryo stops developing, the hormone level in the body will not keep on rising, and the mammary glands and breast follicles lose the stimulation of hormones, and the symptoms of breast swelling will gradually disappear. As you can see, breast swelling in early pregnancy will disappear in a few days, but also need to pay attention to whether there are uncomfortable symptoms, if there are abnormalities, you should consult a doctor to find out the cause of the disease.