Ectopic calcification, also known as ectopic ossification, is a deposition of calcium salts that occurs outside of skeletal tissue in addition to normal physiologic calcification. This change usually occurs at tendon attachments, ligaments, vascular walls, and bone fascia of the skeleton. The precipitation of calcium ions from the skeletal system often leads to the development of osteoporosis, so some scholars advocate ectopic calcification as an indirect sign of osteoporosis. There are many causes of osteoporosis, what do we all know about osteoporosis? In fact, osteoporosis is a disease of abnormal bone metabolism, although the cause of it has not yet been clarified, but the medical profession generally believes that the factors leading to osteoporosis are related to the following aspects. 1, aging: one of the natural phenomena of human aging. 2, estrogen decline: estrogen will stimulate the formation of bone and inhibit the breakdown of bone. If women stop or reduce the secretion of estrogen due to ovarian removal or menopause, it will accelerate osteoporosis, which is one of the factors leading to osteoporosis. 3, nutritional disorders: calcium intake is insufficient or often eat high-protein, high-salt food or addicted to smoking, alcohol, which is one of the factors leading to osteoporosis. 4, abnormal life: lack of exercise, less sunshine.