The difference between premenstrual breast swelling and pregnancy breast swelling lies mainly in the following points: 1. Both breasts will appear swollen, but pregnancy breast swelling is soft when touched by hand, while premenstrual breasts are relatively hard when touched by hand. 2. When pregnant, under the action of estrogen, the nipples and areolas will appear colored, and the nipples will be particularly sensitive when touched by hand, and will have an erection that is This is the result of the action of estrogen. This is the main difference between premenstrual chest pain and pregnancy chest pain. In clinical practice, if there is a history of menopause, a urine HCG test can be done to find out if you are pregnant.