White coat hypertension is caused by mental stress. Drugs are usually not recommended, try to self-regulate and take deep breaths during the physical examination. In addition, you can retest after half an hour of stabilization. When a person is under stress, there is a significant increase in catecholamines in the blood. These are adrenomimetic substances that constrict peripheral blood vessels and raise blood pressure. White coat hypertension is a physiological phenomenon that returns to normal when the tension is relieved. Patients should pay attention to the prevention of the main risk factors of hypertension, so as to achieve a reasonable diet, lose weight, quit smoking and drinking, and carry out appropriate physical exercise. People with white coat hypertension should be good at self-regulation. Make sure you get enough sleep the day before and stay calm during the physical exam. You can go into detail with your doctor during the physical examination and, if necessary, wear a 24-hour sphygmomanometer to prove that you have white coat hypertension.