Sudden hand tremor may be related to physiological factors, hyperthyroidism, Parkinson’s and other causes. 1. Physiological factors: such as emotional excitement, overwork, physical weakness and other factors, can lead to the emergence of hand tremor. Generally, no treatment is needed, and the condition can be relieved after sufficient rest and emotional calming. 2. Hyperthyroidism: For example, when endocrine disorders, can affect the body’s thyroid hormone content, resulting in hyperthyroidism. This leads to hypermetabolism, which promotes sympathetic nerve excitation, leading to abnormal movements of the limb muscles, and thus the symptoms of hand shaking. 3. Parkinson’s disease: it is a common neurological disease. The main manifestation of the hand shaking like rubbing mudballs, especially in the stationary tremor, but also accompanied by bradykinesia, muscle ankylosis and other symptoms. If the symptoms of hand tremor still appear after sufficient rest, it is recommended to go to the hospital immediately to clarify the cause of the disease and facilitate treatment.