Unconscious shaking of the limbs in the elderly can be due to a variety of reasons such as idiopathic tremor, anxiety disorders, hyperthyroidism and Parkinson’s disease. 1. idiopathic tremor: the elderly can appear limb shaking, but the general tremor is mild, and does not affect daily life. 2. Patients with anxiety disorders may experience motor tension and autonomic symptoms, such as fidgeting, anxiety, insomnia, excessive sweating or tremor. 3. Hyperthyroidism patients will have palpitations, hand tremor, weakness and other clinical manifestations due to excessive thyroid hormones. 4. Parkinson’s syndrome can occur in middle-aged and old people due to the degeneration of the nervous system, etc. Patients will have resting tremor, and the upper and lower limbs will be shaking in the resting state. In addition, cerebellar vascular disease, pathogenic bacterial infection of the brain nerves, autoimmune encephalitis and other causes can lead to involuntary tremor of the limbs. It is recommended that patients seek medical treatment as soon as possible and take appropriate treatment according to the cause of the disease.