After pregnancy, due to the influence of estrogen and progesterone, most women experience breast tenderness. However, not all breast tenderness is caused by pregnancy. There are many causes of breast tenderness. For example, some women experience mild cyclic breast tenderness with menstrual cycle changes, which is often physiological. There are also some diseases, such as common breast hyperplasia, that can cause breast tenderness. Of course, some benign or malignant tumors in the breast can also cause tenderness. Therefore, it is recommended that patients with breast tenderness seek timely medical examination at a hospital.