A mammogram is usually painless, but may be painful if the machine presses on the breast. Mammogram is a commonly used examination for breast diseases, which is a non-invasive examination, mainly using X-rays to observe the structure and tissue of the breast, to determine the degree of health of the breast, and to identify benign and malignant tumors of the breast, the examination is generally not painful, but the machine may lead to pain when it presses on the breast. Breast discomfort symptoms can be timely to the hospital, under the guidance of the physician to carry out the relevant examination, if the need for mammography should also actively cooperate with the identification of diseases can be actively cooperate with the treatment. Mammography can also be used to screen women for breast diseases.