Univariate and multivariate regression analysis indicated that the bone loss in prolactinomas was significantly correlated to disease duration and hypogonadism.<br><b>CONCLUSION</b>: In the premenopausal women, patients with prolactinoma or craniopharyngioma are often accompanied with osteopenia or osteoporosis, and disease duration and hypogonadism are the risk factors of bone loss in prolactinoma.