If the hand trembles before drinking, but not after drinking, it may be because the patient suffers from idiopathic tremor, which is also called primary tremor, an involuntary movement disorder of unknown etiology, and 1/3 of the patients have a family history, which may be related to genetics. The main manifestation of this disease is tremor, most often in the hands. This is a postural tremor, which is usually not shaking when the patient is placed in a motionless position, but becomes more pronounced when in a certain position or when performing fine movements. This tremor can also sometimes involve the head, manifesting itself as a slight involuntary shaking of the head, which is often unconscious by the patient. Some patients are sensitive to alcohol, and a small amount of alcohol, especially white wine, can rapidly reduce the shaking, but the duration is short, usually only about 2-3 hours, and the shaking will reappear after the effect of alcohol. Propranolol is generally used to reduce and control the symptoms, but it is necessary to monitor the heart rate at the same time to prevent slow heart rate and low blood pressure.