The common causes of hand and foot cramps in the elderly are the following: 1. Cramps in the elderly due to long-term calcium deficiency. 2. Cramps in the elderly due to low blood potassium, which are often combined with hyperthyroidism, can further improve blood tests to clarify the diagnosis. 3. The elderly can also suffer from idiopathic muscle tremors, which can cause cramps in their hands and feet. 4. Cramps in the hands and feet of the elderly are often caused by cerebrovascular diseases, such as age-related idiopathic tremor and Parkinson’s disease, which require further improvement of cranial magnetic resonance and other related examinations to clarify the diagnosis.