After ovulation, the chest has been swollen may be due to the following problems: First, endocrine disorders, such as after ovulation due to the formation of the corpus luteum, the local secretion of estrogen in the ovary will be much larger than progesterone, which will lead to the appearance of localized swelling of the breasts, and often the patient is also accompanied by insomnia, dreaming, and anxiety and other corresponding symptoms. Secondly, after ovulation, if you ever have sex during ovulation, it is possible that the breast swelling and pain is caused by pregnancy, through the basal body temperature monitoring will usually appear basal body temperature is high, high temperature state is often greater than 15 days, the possibility of pregnancy will be very large, because after the pregnancy will lead to an increase in estrogen and progesterone in the body, so the breast tissue in the estrogen and progesterone, it will be swollen and painful. The breast tissue will be swollen and painful under the effect of estrogen and progesterone.