Taking Daying-35 will cause breast swelling and pain, mainly because Daying-35 contains estrogen and progesterone, and the growth and development of the mammary glands have a great relationship with estrogen and progesterone, so for some women with breast hyperplasia or relatively sensitive women, after taking Daying-35 will lead to localized swelling and pain in the breast. In this case, it is recommended to do the appropriate examination before taking Daying-35, if there is high blood pressure can not take this drug, if there is breast hyperplasia is not recommended to take Daying-35, if there are uterine fibroids can not take Daying-35, you can use other methods of treatment or other methods of contraception to give birth control, so as not to cause more serious clinical harm. In addition, very few people may be allergic to Dayin-35, once allergy occurs, it is recommended to go to the hospital immediately to give anti-allergy treatment.