Patients drink tea and coffee when the symptoms of dizziness, mainly consider the following causes: 1, because tea, coffee and other beverages belong to excitatory drinks, such as tea contains theophylline, tea polyphenols and other substances. There is also caffeine can affect the blood supply to the brain, can cause patients to appear dizzy symptoms, such substances have a strong heart, excite the central nervous system. If the tea is too strong or drink too much coffee, easily lead to sympathetic excitation caused by tachycardia, will affect the blood supply to the heart muscle, so it will cause cardiogenic cerebral insufficiency, the patient will have dizziness symptoms. 2, because drinking tea has a diuretic effect, if the patient increased urination, blood volume decreased, can also cause the patient to appear reflex dizziness.