No need to worry, though you might need to buy new bras.

Shrinking size

shrinking breast sizemoodboard/Getty Images
If you find your chest shrinking, you’ve likely either lost weight or your estrogen levels are falling, perhaps from going off the pill or impending menopause. If you’re seeing shrinkage and none of those apply (especially if you also have hair loss, acne, and facial hair), consider being tested for polycystic ovary syndrome (PCOS), which is characterized by high levels of the hormones testosterone and DHEA. Or maybe just lay off the Starbucks. A study in the British Journal of Cancer found that drinking three cups of coffee a day caused breasts to shrink in some women, with additional cups increasing the effect. The culprit is a gene shown to link breast size to coffee consumption.

4
Large breasts

large breastsMelina Hammer/Getty Images
If you’re generously