Calcium deficiency exists in individuals who are not getting enough calcium intake through their daily nutrition or supplement intake. In the case of a deficiency, you may find that your body to be functioning not so normally. In the event of a potential deficiency, it has a warning signs. First, the natural calcium storage within the bones becomes depleted. As a result, the bones begin to waken and thin at an alarming rate. This deficiency can also lead to osteoporosis, a disease of the bones that triggers bone degeneration, a ‘humped’ back, a major increased risk of fractures, and other serious concerns.