Chinese tea culture has a long history, tea has a refreshing, fatigue, fat loss, thirst and other effects, very popular. However, if you drink too much tea, it may harm your body, especially for middle-aged and elderly people, excessive consumption of strong tea will increase the heart load. Some studies support that drinking strong tea can increase blood pressure. The reason is mainly because the theophylline contained in strong tea can cause brain excitement, restlessness, insomnia and palpitations, leading to an increase in blood pressure. In addition, the stimulating effect of caffeine will prompt a rapid heartbeat, accelerated blood flow, accelerated respiration, which can easily lead to cardiac arrhythmia or tachycardia, resulting in symptoms of palpitations, which is a potential threat to patients with cardio-cerebral vascular atherosclerosis. Furthermore, tea itself can enhance ventricular contraction, accelerate the heart rate, strong tea will make the above effects intensify, inducing chest tightness and other abnormal phenomena, serious cases can cause dangerous consequences. On the other hand, strong tea due to the tea leaves soaked for too long, contains a large amount of tannic acid, will affect the body’s absorption of protein and other nutrients, easy to cause constipation, increase myocardial oxygen consumption, which is unfavorable to patients with coronary heart disease. And a large number of drinking strong tea, will increase blood volume, to a certain extent, aggravate the burden on the heart and heart failure symptoms. It should be noted that the tannin in tea, theophylline is also easy to hypnosis, sedation and other drugs and iron-containing blood supplements, enzymes and other drugs undergo chemical changes, it is generally believed that the medication should not drink tea within 2 hours. The amount of tea consumption is determined by the tea drinking habits, age, health, living environment, customs and so on. Studies have shown that healthy adults, usually have the habit of drinking tea, about 12 grams of tea a day, 3 grams each time, with 150 milliliters of water is appropriate.