Decreased bone mass and osteoporosis are different stages of the same disease, and both will show a decrease in bone mass. The reduction in bone mass in osteoporosis will be more severe. Bone loss is the previous stage of osteoporosis and can also indicate that osteoporosis is more severe than the symptoms of bone loss. When bone mass decreases, you can choose to take calcium-supplemented food, get more sunlight to promote the synthesis of vitamin D in the body, which helps the absorption and production of calcium, or you can take calcium tablets, and also strengthen physical exercise, which can slow down the phenomenon of bone mass decrease. If osteoporosis occurs and the T value of bone density test result is less than minus 2.5, it means that the symptoms are very serious and should be treated in time, otherwise fractures will easily occur when there is a fall.