The pain, hardness and swelling of the breasts after a miscarriage will usually subside naturally in about a week. A woman’s body produces different hormones such as estrogen and pregnancy when she is pregnant than when she is not pregnant, so abortion means termination of pregnancy, which has a significant impact on a woman’s endocrine system and the lining of the uterus. Changes in hormone levels after the procedure may cause pain or tingling in the breasts, or even hard knots and swelling in the breasts, which are caused by excessive fluctuations in the levels of lactogen and estrogen and progesterone in the body. If the symptoms are mild, no special treatment is needed and most patients will recover on their own after a week. However, if the miscarriage is at a large number of weeks and is a large-trimester miscarriage, further symptomatic treatment may be required. In addition, patients should take more rest after miscarriage, avoid spicy stimulation and cold food; they can relieve symptoms by applying hot compresses and go to the obstetrics and gynecology department of the hospital for regular review.