In general, the signals of calcium deficiency include easy cramps, unhealthy oral cavity, leg pain and other phenomena. 1. Easy to cramp: at night in the sleep, due to calf cramps were awakened, because calcium ions can make the nerve cell membrane stabilization, is conducive to reducing neuromuscular excitability, in the absence of calcium, the nerve cells can not carry out normal activities, which can easily lead to neuromuscular excitation symptoms of muscle twitching. 2. Oral unhealthy: lack of calcium is also easy to cause oral unhealthy problems, yellowing and blackening of the teeth, toothache, bleeding gums and other problems, that the human body has begun to lack of calcium. 3. Leg pain: with the age, the body’s hormone level changes, calcium deficiency will lead to osteoporosis, so the patient will feel leg pain. In addition, the lack of calcium will also lead to other symptoms, should go to the hospital in time for examination, after clarifying the cause of the disease, under the guidance of the doctor for appropriate treatment.