The causes of shivering and shaking in the abdomen of the elderly include calcium deficiency, gastrointestinal cramps and muscle spasms. 1. Calcium deficiency: with age, the loss of calcium in the bones of the elderly will gradually accelerate, and the lack of calcium will lead to abnormal muscle cell excitability, which will lead to the symptoms of shivering and shaking in the abdomen. For this situation, it is recommended to eat more calcium-rich foods and actively take vitamin D, which can effectively alleviate this problem. 2. Gastrointestinal spasm: the old shivering and shaking in the abdomen of the elderly may be caused by gastrointestinal spasm, gastrointestinal spasm will lead to involuntary contraction of intestinal muscles, which in turn leads to this phenomenon, which may be affected by gastric disease factors. If this situation occurs for a long time, it is recommended to go to the hospital as soon as possible for examination, and then step by step treatment to avoid further deterioration of the condition. 3. Muscle spasm: when the excitability of the abdominal muscles of the elderly is elevated too quickly, or the abdominal wall nerve regulation ability is abnormal, it is easy to lead to muscle spasms, resulting in the phenomenon of shivering and trembling of the abdomen. If it is caused by disease, it should be treated for the cause. If it is affected by the temperature change, you should add clothes in time and improve the sense of protection. There are many reasons for the old shivering and shaking in the abdomen of the elderly, you should consult a doctor in time to identify the cause of the disease, and actively comply with the medical advice for treatment.