Leigh Erin Connealy, M.D. on Instagram: "The breast is uniquely sensitive tissue, designed to respond to hormonal signals throughout a woman’s life—puberty, menstrual cycles, pregnancy, and menopause. Because of this responsiveness, the same hormones that guide normal development can also, under the wrong conditions, contribute to disease. Most breast cancers are driven by estrogen, a hormone that stimulates cell growth and proliferation. Estrogen’s role is not inherently harmful, it is essentia