Decreased bone mass, which should be accurately described as decreased bone mass, is commonly associated with osteoporosis. Osteoporosis is most common in the elderly, but there are also some cases of osteoporosis caused by long-term use of hormones and other drugs. In young women, postmenopausal osteoporosis is caused by hormonal disorders after hysterectomy or ovarian surgery. There is also wasting osteoporosis, which is caused by prolonged bed rest and lack of exercise. All of the above conditions belong to osteoporosis, and all of them will result in bone loss. The correct treatment should be, active anti-osteoporosis treatment, at the same time pay attention to calcium supplementation to promote bone production.