The occurrence of osteoporosis is related to a variety of factors, mainly including the following aspects: 1, the middle-aged and the elderly sex hormone secretion is reduced, especially in women after menopause estrogen levels decline is one of the important causes of osteoporosis, can lead to increased bone resorption; 2, with the growth of age, the secretion of calcium-regulating hormone imbalance resulting in disorders of bone metabolism; 3, the elderly poor, eat less, there is often insufficient protein, calcium, phosphorus, vitamins and trace elements intake; 4, outdoor exercise is reduced is also an important reason for the elderly susceptible to osteoporosis.