1, fever avoid tea tea caffeine in tea can not only make the body temperature, but also reduce the effectiveness of drugs. 2, liver patients do not drink tea tea caffeine and other substances in the vast majority of the liver metabolism, if the liver is sick, drinking too much tea more than the metabolic capacity of the liver, it will be detrimental to liver tissue. 3, neurasthenia caution tea tea caffeine in the role of excitation of the nerve center, neurasthenia drinking strong tea, especially in the afternoon and evening, it will cause insomnia, aggravating the condition, you can drink tea in the morning and after the afternoon, in the morning may wish to drink tea, green tea after lunch, no tea at night. In this way, the patient will be invigorated during the day, the night static comfort, you can go to sleep earlier. 4, pregnant women should not drink tea, especially not strong tea Tea contains a large number of tea polyphenols, caffeine, etc., on the growth of the fetus in the mother’s womb there are many unfavorable factors, in order to make the normal development of the fetal intelligence, to avoid excessive stimulation of the fetus caffeine, pregnant women should drink less or do not drink tea. 5, women should not drink strong tea during lactation Drinking strong tea during lactation, too much caffeine will enter the breast milk, the child will indirectly produce excitement after sucking the breast, easy to cause less sleep and more crying. 6, ulcer patients caution tea tea is a gastric acid secretion stimulant, drinking tea can cause increased gastric acid secretion, increasing the stimulation of the ulcer surface, often drinking strong tea will contribute to the deterioration of the disease. However, for mild patients, you can drink some light tea 2 hours after taking medicine, black tea with sugar, black tea with milk helps anti-inflammatory and gastric mucosa protection, and also has a certain effect on ulcers. Drinking tea can also block the synthesis of nitroso compounds in the body to prevent precancerous mutations. 7, malnutrition avoid tea tea has the function of decomposing fat, malnutrition, and then drink tea to decompose fat, will make the nutrition more poor. 8, drunkenness caution tea tea has a stimulating effect on the nerve center, drunkenness and drink strong tea will increase the burden on the heart. Drinking tea will also accelerate the diuretic effect, so that the toxic aldehyde in alcohol has not been decomposed from the kidneys, the kidneys have a greater irritation and health hazards. Therefore, the heart and kidney disease or poor function of people, do not drink tea, especially not drink a lot of strong tea; for healthy people, you can drink a small amount of strong tea, to be sober, can be used to eat a lot of fruit, or small mouthfuls of vinegar and other methods to speed up the body’s metabolic rate, so that drunkenness relief. 9, be careful with tea medication drug variety, the nature of different, can be taken with tea medication, can not be generalized. Tea tannin, theophylline, and some drugs and chemical changes, therefore, in taking hypnotic, sedative and other drugs and taking iron tonic, enzyme drugs, containing proteins and other drugs, because tea polyphenols are easy to interact with iron and produce precipitation, should not use tea to send drugs, in order to prevent the effect of drugs. Some herbal medicines such as ephedra, hooked vine, Huanglian, etc. should not be mixed with tea, it is generally believed that tea should not be taken within 2 hours. While taking certain vitamin drugs, tea has no effect on the efficacy of the medicine, because the tea polyphenols in tea can promote the accumulation and absorption of vitamin C in the body, at the same time, tea itself contains a variety of vitamins, tea itself also has excitement, diuretic, lowering blood lipids, lowering blood sugar and other effects on the human body can enhance the efficacy of the medicine, restore health is also beneficial. In addition, in the folk often believe that when taking tonic medicines such as ginseng and mushrooms, should not drink tea, there is also some truth to it. 10, anemia patients should not drink tea tea tannic acid can be combined with iron into insoluble end compounds, so that the body does not get enough sources of iron, so anemic patients should not drink tea. 11, urinary stones patients do not drink tea urinary stones are usually calcium oxalate stones, because tea contains oxalic acid, will be excreted with urine calcium and the formation of stones, if urinary stones patients then drink a lot of tea, will aggravate the disease. 12, avoid drinking tea on an empty stomach drinking tea on an empty stomach will dilute the stomach acid, but also inhibit gastric juice secretion, hinder digestion, and even cause palpitations, headache, stomach discomfort, blinking, distraction and other “tea drunk” phenomenon, and affect the absorption of protein, but also cause gastric mucositis. If “tea intoxication” occurs, you can mouth candy or drink some sugar water can relieve. 13, avoid drinking a lot of tea before and after the meal about 20 minutes before and after the meal should not drink tea, if drinking tea, will dilute the gastric juice, affecting food digestion, and because tea contains oxalic acid, oxalic acid will react with the iron and protein in the food, affecting the body’s absorption of iron and protein. 14, avoid drinking tea before bed It is best not to drink tea within 2 hours before bedtime, drinking tea will make the spirit of excitement, affecting sleep, and even insomnia, especially the newly picked green tea, after drinking, the nerves are very easy to excite, causing insomnia. 15, avoid drinking overnight tea tea to bubble now drink is better, tea for a long time, not only will lose vitamins and other nutrients, and easy to rancid and spoiled, drink easy to get sick. 16, do not drink the first tea because modern tea in the planting, processing, packaging process will inevitably be contaminated by pesticides, fertilizers, dust and other substances. The first tea is actually the water to wash the tea, should be as soon as possible to out and then brewed into the boiling water, so that the tea is the most hygienic tea. 17, do not drink poor quality tea or spoiled tea tea is not easy to properly store, easy to absorb moisture and mold, and some people out of love tea savings, can not discard the moldy tea. Deteriorated tea contains a large number of substances harmful to humans and germs, is absolutely not drinkable. If the quality of tea brewed if left too long, the tea soup will also be oxidation and microbial reproduction and deterioration, so the tea can no longer drink. 18, children should not drink strong tea because the concentration of tea, tea polyphenol content is too much, easy to interact with the iron in food, is not conducive to the absorption of iron, easy to cause iron deficiency anemia in children. Children can drink some light tea in moderation (one-third of the concentration of tea drunk by adults). For preschool children can drink some coarse tea, because the tea polyphenol content in coarse tea is low. 19, coronary heart disease patients cautiously drink tea for the heart rate is too fast, premature beats or atrial fibrillation of coronary heart disease, because the caffeine in tea, theophylline are stimulants, can enhance the function of the heart, drink a lot of strong tea will make the heartbeat faster, often leading to its onset or aggravate the disease, so such people can only drink some light tea; in contrast, the heart rate is generally below 60 times / min patients, should drink more tea, not only harmless but rather can improve the heart rate, with the role of drug therapy. 20, the elderly should not drink raw tea The so-called raw tea refers to the green tea baked without twisting and drying directly after killing. The appearance of this tea is naturally green and verdant, and the inner composition is basically the same as the compounds contained in the fresh leaves, with low boiling point aldehydes and alcohol compounds transformed and volatilized, and the fragrance with a serious raw green gas. The elderly drink this green tea, the gastric mucosa irritation is very strong, easy to drink stomach pain; young people will also feel stomach discomfort after drinking, which is commonly known as “scraping the stomach”. Mistakenly purchased this raw tea, it is best not to drink directly, can be placed in a non-greasy iron pot, slowly fried with a civilian fire, roasted to remove the raw green gas, to be produced after a light chestnut fragrance can be drunk. 21, hypertensive patients should not drink strong tea head bubble tea with less than 50 ml of boiling water per gram for “strong tea”. Hypertensive patients who drink too much too strong tea, due to the excitatory effect of caffeine will trigger an increase in blood pressure, which is not conducive to health.