There are many reasons for hand trembling, and when it is serious, we need to pay attention to it, because it is likely to indicate the health condition of your body, as well as the omens of some diseases. The first is Parkinson’s disease, when you can not control one side of the body limbs, especially at rest shaking significantly, when the movement is relieved. And this disease is mostly found in middle-aged and elderly people, and the incidence is higher in men, so middle-aged and elderly men need to pay attention to whether they are suffering from Parkinson’s disease. The second is idiopathic tremor, the cause of which has not yet been identified. The tremors are mainly in the upper extremities and head, and the tremors are noticeable during movement and relieved at rest. It is also hereditary and needs attention if there are similar patients in the family. In addition, it may be hyperthyroidism, and if it is easy to sweat when the hands shake, faster heartbeat, and weight loss, it needs to be treated promptly at the hospital. Finally, it may be a cerebellar lesion, which is mostly a volitional tremor, and the trembling is more pronounced when the patient approaches the object he or she wants to approach in the will. Therefore, when the patient has hand tremor, he needs to pay enough attention to it, because hand tremor is likely to be a harbinger of certain diseases. At this time, we’d better go to the hospital so that the doctor can determine the cause of the disease and cooperate with the treatment.