Ectopic pregnancy, as the name implies, refers to the implantation of the gestational sac outside the uterine cavity, with common implantation sites including the fallopian tubes, ovaries, and the pelvic abdomen. Although an ectopic pregnancy is a pathological condition, it still falls within the category of pregnancy. Therefore, the common early pregnancy symptoms, such as those seen in early pregnancy, still occur in ectopic pregnancies. Whether it's an intrauterine pregnancy or an ectopic pregnancy, breast pain during early pregnancy is common in most cases, primarily due to increased levels of estrogen and progesterone in women during early pregnancy. This leads to stimulation of the mammary glands and the proliferation of some mammary ducts, resulting in breast pain, which is normal. However, since the hormone levels in women with ectopic pregnancies are relatively lower, the sensation of breast pain is less than that in normal intrauterine pregnancies.