Signs of calcium deficiency in the elderly include muscle spasms, loose teeth, back and leg pain, and shortening of height. 1. Muscle cramps: when the elderly are deficient in calcium, the level of calcium ions in the blood serum will also be reduced, which will lead to increased neuromuscular excitability, thus resulting in the symptoms of muscle cramps, and the serum calcium test and other tests can assist in clarifying the situation. 2. Loose teeth: when the elderly lack of calcium, it will lead to loose tooth enamel, which will lead to loose teeth and loss of teeth. 3. Lumbar and leg pain and shortening of height: osteoporosis occurs when the elderly are deficient in calcium, and common symptoms include lumbar and leg pain, shortening of height due to vertebral compression fracture, and hunchback, etc. Ultrasound bone mineral density test can assist in clear diagnosis. Calcium deficiency is very common in the elderly, and there are many signs of calcium deficiency. It is necessary to regularly monitor serum calcium, bone density and other indicators to supplement calcium in a timely manner. If any of the above symptoms appear, you should consult a doctor in time.