Decreased bone mass on physical examination refers to a decrease in bone mass per unit volume of bone, and osteoporosis shows a decrease in bone mass at an early stage, so decreased bone mass is a state between normal bone mass and osteoporosis. Bone loss is commonly caused by the following reasons: First, it may be due to poor lifestyle habits, such as smoking, heavy drinking, large amounts of carbonated beverages, lack of exercise, and partial eating. After menopause, the secretion of estrogen in women will drop significantly, leading to active osteoclasts, causing bone loss and bone loss. Third, secondary diseases such as hyperparathyroidism and hyperthyroidism can also lead to bone loss. When bone loss occurs, eat more calcium-rich foods, such as shrimp, fish, milk, etc. You can also increase exercise, improve your mood, and do more outdoor activities to help promote calcium deposition. If necessary, calcium supplementation can be targeted, and patients with obvious osteoporosis can take oral anti-osteoporosis drugs such as alendronate tablets.