不罕见。可能和增重有关。

http://europe.obgyn.net/nederland/mp/RBP/RBP2004.pdf

In conclusion, about one in five women experiences an increase in breast size after menopause. The most important factors associated with such an increase were found to be weight gain in the past 5 years, a high waist and a high hip circumference, and a high Quetelet’s index after menopause.

大约有20%的妇女更年期后胸围尺寸增加。最重要的影响因素包括：1。过去5年内体重增加；2。较高的腰围/臀围比例；3。高Quetelet指数（BMI）。

更年期后，要特别注意饮食、锻炼，维持健康体重，定期检查，并注意身体的变化。