The main concern for women in their 20s and 30s is breast discomfort, which is usually a sign of fibrocystic breasts due to cysts in the breast tissue that often increase in size in the last half of the menstrual cycle. These hormonally related fluctuations in size often result in tenderness and raise concerns in women about being a sign of cancer. Fibrocystic breast changes are not correlated with an increased risk of breast cancer, but if you are noticing changes in your breasts, you should talk with your physician.
Avoiding caffeine is commonly recommended with fibrocystic breast-related tenderness, although clinical research has shown mixed results. The good news is that only 5 percent of breast cancer cases occur in women younger than 40, and mammograms are generally not recommended until after age 40 unless there is a strong family history of cancer, in which case genetic testing may be advised.