Patients can determine whether the leg pain is caused by cold, or calcium deficiency by the following methods: First, touch the local skin temperature, if it is cold, the local skin temperature will mostly significantly lower, give local hot compresses, the symptoms will be quickly relieved. While calcium deficiency skin temperature does not change significantly, hot compresses can only short-term relief of clinical symptoms. Second, the leg pain caused by cold, usually serum calcium ion concentration test no significant changes. In the case of leg pain caused by calcium deficiency, the calcium ion concentration will usually decrease and the bone density will also decrease. Third, cold can cause leg cramps, but they are not serious. And calcium deficiency may cause leg and hand cramps with perioral numbness. By combining the above methods, we can confirm whether the cause of leg pain is cold, or calcium deficiency.