Tea is one of the most ancient drinks in China. A lot of modern scientific researches have confirmed that, tea leaves have a variety of medical effects to human body, such as refreshing the brain and purifying the heart, clearing away summer heat, promoting digestion and reducing phlegm, etc. However, although tea brings a lot of benefits to human health, it is not suitable for every one. There are some people with specific diseases or under specific conditions that should not drink tea. Otherwise, it may cause serious consequence to the body. Generally speaking, there are mainly the following ten groups of people.

First, people with iron deficiency anemia
The tannic acid contained in tea can affect the absorption of iron by the body, so it will aggravate the condition of anemia.

Second, people suffering from neurasthenia
Tea contains some amount of caffeine, which can make people excited, and promote the basic metabolism of the body, thus increasing the phenomenon of insomnia.

Third, gastric ulcer patients
The caffeine contained in tea will stimulate the secretion of gastric juice, which will further aggravate the condition of the disease and affect the healing of ulcer.

Fourth, patients who suffer from urinary tract stones
Tea contains some oxalic acid, which will increase the stones in the urinary tract.

Fifth, people with liver dysfunction
Most of the caffeine in tea is metabolized by the liver, so if the people suffering from liver dysfunction drink tea, it will increase the burden on the liver, which may further make the disease much worse.

Sixth, people suffering from constipation
The tannic acid in tea has an astringent effect, which can weaken the peristalsis of the intestinal canal, thus aggravating constipation.

Seventh, women during the lactation period
The caffeine contained in tea will enter into the body of the infants through the breast milk, which will lead to the intestinal spasm and anemia of the infants, and may even affect their sleep.

Eighth, patients with heart disease
If the people suffering from heart disease drinking too much tea, it will speed up their heartbeat. What's worse, it may even cause arrhythmias.

Ninth, pregnant women
If the pregnant women drink too much tea, it will greatly affect the health of the fetus, making the baby thin and frail.

Ten, people who have been drunk
Alcohol has great stimulation on the cardiovascular, while the caffeine in tea can speed up the heartbeat. When they play their function together, it is very dangerous to people who have poor heart function.