The main reasons for this are: 1. Breast inflammation, mainly seen in women who gave birth for the first time during the lactation period, breast pain accompanied by reduced milk, redness, swelling, fever and other discomfort, the pain site can be the right side of the breast. 2. Breast hyperplasia, mostly seen in women of childbearing age, considered to be related to the body’s estrogen secretion, breast pain accompanied by lumps, the symptoms are more obvious before the onset of menstruation, gradually disappear after the menstruation. 3. It is a common benign tumor in women with painful symptoms on the right side of the breast. 5.Breast cancer may not be uncomfortable at the beginning, and when pain occurs, a lump can be felt by hand with unclear border.