The difference between simple and complex fibroadenomas lies in their composition and potential risk factors. Simple fibroadenomas are composed of fibrous tissue and are generally not associated with an increased risk of breast cancer in most women. On the other hand, complex fibroadenomas may exhibit more proliferative changes and could be linked to a slightly higher risk of breast cancer, especially in cases where there is a family history of the disease. It is important to consult with your healthcare provider to determine the specific type of fibroadenoma you have and assess your risk factors before starting any hormonal treatments.