Drinking tea is good for health, but there are also taboos: the elderly, the infirm, pregnant women and insomnia should drink less tea; People with poor renal function and heart disease should avoid drinking strong tea; Can't drink overnight tea; It is not advisable to drink tea during medication; People with severe arteriosclerosis, hypertension, ulcers and fever should avoid drinking tea; People with stomach deficiency, cold stomach and bad spleen and stomach should avoid drinking tea on an empty stomach; Children and women under three years old should not drink tea during menstruation and pregnancy; Deteriorated tea is not drinkable.