Breast cancer can also occur in the teenage years, but the chances will be less. The main causative factors of breast cancer are not directly related to age, and breast cancer can occur at any age in already developed breasts. Causes of breast cancer generally include hormones, heredity, and radiation. Early menarche and a higher fat content in the daily diet can enhance the stimulation of breast epithelial cells by estrogen, thus increasing the chances of developing the disease. Poor lifestyle and environmental factors are related to the development of breast cancer, so it is important to maintain a healthy diet in daily life and try to choose low-fat, high-quality protein foods. Therefore, once breast discomfort occurs, it is necessary to consult a doctor in time for early detection and early treatment.