Common causes of rapid heart rate and hand tremors include hyperthyroidism, hypoglycemia, and arrhythmia. 1. Hyperthyroidism: the thyroid gland is the largest endocrine gland in the human body, plays a role in the regulation of the body’s other hormones, to promote the body’s metabolism, due to the rise in thyroid hormones, resulting in the body’s metabolism and sympathetic excitation, causing sweating and fear of heat, tachycardia, insomnia, and other symptoms, diagnosed through the thyroid function test. 2. Hypoglycemia: Hypoglycemia is a low blood sugar symptom due to low concentration of intravenous plasma glucose in the body, usually with sweating, panic, blushing, trembling, etc. This symptom should be supplemented with energy in time, and appropriate steamed bread and cookies should be eaten, and repeated occurrences of this symptom are recommended to consult a doctor. 3. Arrhythmia: If the patient himself has a history of heart disease, sudden rapid heart rate, shivering may be the emergence of acute coronary syndrome or arrhythmia, at this time you can carry out an electrocardiogram, myocardial enzyme examination. The causes of rapid heart rate and shaking hands are very complex, and need to be combined with the patient’s accompanying symptoms, complete the relevant examinations to clarify the specific causes of the disease, and then systematic treatment.