Usually, breast changes may occur around 6 weeks of pregnancy, mainly manifested as breast swelling and pain, breast enlargement, darkening and widening of the areola, etc. This is caused by changes in estrogen and progesterone, which are normal physiological changes and do not require special treatment. If you have a history of breast enlargement, breast cysts or even breast fibroids, the symptoms of breast swelling and pain will be relatively obvious, and if necessary, breast ultrasound will be performed to clarify the severity. Generally, in the middle and late stages of pregnancy, as the breasts increase in size and the milk channels open up to store milk, it may cause lactation, so you need to pay attention to nipple hygiene to avoid nipple infection. Do not overstimulate the nipples during pregnancy without special circumstances to avoid inducing contractions that may lead to preterm abortion or preterm labor.