The relation between consumption of coffee, tea, and caffeine and risk of breast cancer remains unsettled. We examined data from a large, long-term cohort.
Caffeine & Breast Cancer: Does It Increase the Risk? While we don’t know what causes breast cancer, we do know about some of the risk factors, including: A 1985 study involving over 3,000 women negated any increase in breast cancer risk from drinking coffee.
Too much caffeine may possibly increase your risk of breast discomfort. There's also no evidence to suggest a link between caffeine and breast cancer.