1.What causes osteoporosis? The etiology is less clear and is related to reduced hormone levels, genetics, poor lifestyle habits, nutritional, drug application, disuse, and disease. 2.Osteoporosis in the elderly is a complex, chronic pathological process produced by a variety of factors. What are the causes of this disease? (1) Osteoporosis is particularly common in postmenopausal women, caused by the lack or reduction of estrogen. (2) Osteoporosis is more common in whites, especially in northern Europeans, followed by Asians, and less common in blacks. (3) Calcium intake in adolescence has been found to correlate with bone mass in adulthood, and long-term protein deficiency causes insufficient synthesis of bone mechanism protein, resulting in lagging of new bone production, and if there is also calcium deficiency, osteoporosis will appear faster. (4) Due to reduced activity of the elderly, the muscle strength is weakened, mechanical stimulation is less, and bone mass is reduced. (5) Anticonvulsants, such as sodium phenytoin, phenobarbital, and carbamazepine, cause treatment-related vitamin D deficiency, as well as impaired intestinal calcium absorption. (6) Long-term hormone application. (7) Alcohol abuse, smoking. Drinking coffee and cola frequently. 3.Why should osteoporosis in the elderly be given high priority? What are the symptoms and hazards of osteoporosis? Osteoporosis often presents with pain, hunchback, height reduction, fracture and so on. Among them, fractures are very dangerous, mostly hip fractures, spine fractures and wrist fractures. Complications such as bed sores, lung infections and thrombosis after fractures often endanger patients’ lives.