Elderly people with shaky hands is commonplace, but now we often see some people at a young age, hand shaking, and such people in public will be very inferior, afraid of others laugh, in life and work in the work of self-confidence. Hand shaking, medically known as tremor. It is only a symptom, is a part or all of the body manifested as an involuntary rhythmic tremor. Tremor is common in the hands, followed by tremor in the head, and rarely in the lower extremities. The tremor of this disease is aggravated by concentration, nervousness, fatigue and hunger, disappears after sleep, and is aggravated the next day. 1, idiopathic tremor idiopathic, refers to the cause of other organic lesions can not be found. This type of tremor can often last for decades without particularly significant aggravation. Idiopathic tremor most often occurs in the head, hands or upper limbs, and can sometimes affect the voice, and even the lower limbs and trunk. It can develop at any age and can even begin in childhood and become more pronounced in early adulthood or middle age. Idiopathic tremor is the most common form of “postural-motor tremor”, which means that it can occur when holding a certain position or performing a target movement, for example, when reaching for both upper limbs, or when writing, drinking from a glass of water, or fingering the tip of the nose. Idiopathic tremor affects approximately 5% of the world’s population and has a more pronounced amplitude than physiologic tremor, with a frequency of 6-12 Hz. 30-70% of patients with idiopathic tremor have a family history of the condition, and although the causative gene has not been identified, patients with familial idiopathic tremor show autosomal dominant patterns of inheritance. Interestingly, unlike physiologic tremors, a small amount of alcohol can reduce idiopathic tremor, and coffee does not exacerbate idiopathic tremor. Generally speaking, idiopathic tremor also rarely affects daily work and life, but some people need to receive treatment if it becomes more serious and even affects normal body functions. 2, Parkinson’s disease tremor Parkinson’s disease is a neurodegenerative disease, and its tremor is stationary tremor. We have already talked about, stationary tremor refers to the limbs in the completely relaxed rest or supportive situation of the tremor, such as sitting on the couch to watch TV, lying in bed when appeared, once the limbs began to move, this kind of tremor disappeared. A typical Parkinson’s disease tremor is a “pill-rubbing” movement of the hands, with a frequency of 4-6 Hz. It sounds like this tremor should not affect your life at all, because it disappears as soon as there is movement. In fact, as soon as the movement stops, the resting tremor will immediately reappear and can interfere with the completion of the movement when the limb has to assume a certain position against gravity, for example, eating with utensils, writing, typing, brushing teeth, etc. It is also important to note that tremor in many types of disease is not strictly limited to a single type. For example, Parkinson’s disease can be combined with other types of tremor, such as postural tremors, which are more pronounced when the tremor is at rest. In addition, for Parkinson’s disease, it also manifests itself with four major motor signs: bradykinesia, resting tremor, myotonia, and postural abnormalities. The most important core symptom is bradykinesia, which is diagnosed with great caution as the disease progresses and the patient consistently does not have bradykinesia. There are 20%-30% of Parkinson’s patients who do not have tremor symptoms at the beginning of the disease, so there is no tremor, it is equally likely to be Parkinson’s disease.