After drinking tea, dizziness is caused by the following four reasons: 1, tea polyphenols in tea, will cause symptoms of cerebrovascular insufficiency of blood supply, and therefore will cause dizziness, and even headache, etc. It is because the tea polyphenols in tea make the brain capillaries overly dilated, and therefore cause certain symptoms of large blood vessels insufficiency of blood supply, which leads to dizziness. 2, the factors that cause dizziness after drinking tea, and hypoglycemic reaction, because 3, dizziness after drinking tea is often due to arrhythmia, tachycardia and other causes, resulting from the tea in the tea polyphenols dilate cardiovascular, causing arrhythmia, increased speed of myocardial contraction, tachycardia and trigger the heart aorta 4, drinking tea after a one-time intake of too much caffeine will cause excessive excitement in the central nervous system, resulting in a sudden decrease in blood pressure, thus causing dizziness.