With the aging of the population, the number of people suffering from osteoporosis is increasing, what kind of cases need to do bone density examination? The American Osteoporosis Association and the Chinese Society for Bone Mineral Salts recommend the following people to have bone density: 1. women over 65 and men over 70 without other risk factors for osteoporosis; 2. women under 65 and men under 70 with one or more risk factors for osteoporosis; 3. adults of both sexes with a history of fragility fracture or (and) a family history of fragility fracture; 4. adults of both sexes with various causes of Adults of both sexes with low sex hormone levels due to various causes; 5. Those with osteoporotic changes on X-ray; 6. Those with diseases affecting bone mineral metabolism (e.g. rheumatoid arthritis) and drug history (e.g. glucocorticoids); 7. Those with reduced height (current height is 4 cm or more lower than the maximum height); 8. Those with expected reduced height (current height is 2 cm or more lower than the recently measured height). So what are the risk factors for osteoporosis? Alcoholism, thin body size, high salt diet, bed braking, smoking, low calcium diet (e.g. vegetarian), low physical activity, vitamin D deficiency, frequent falls, anorexia nervosa, abdominal obesity, hyperthyroidism, early menopause (before age 40), malabsorptive individuals, type 1 or 2 diabetes, pancreatic disease, celiac disease, rheumatoid arthritis, systemic lupus erythematosus, chronic obstructive pulmonary disease, stroke, depression, weight loss end-stage renal disease, etc. What is a fragility fracture? It is a fracture that occurs in response to a small external force. For example, when no fracture should occur under normal circumstances, such as bending over to lift heavy objects, coughing, drying clothes, etc.