Whether drinking black tea will be constipated depends on the amount of drinking to determine, moderate drinking generally does not cause constipation, long-term excessive drinking may cause constipation. Black tea contains a certain amount of caffeine and theophylline and other substances, appropriate consumption can help digestion, does not cause constipation, and can also help improve appetite and diuretic swelling. However, if you drink a lot of tea for a long time, too much theophylline and caffeine will inhibit the nervous system, so the gastrointestinal tract peristalsis will slow down, the contents of the intestinal tract will be affected by the discharge of the contents of the intestinal tract, in which case it may cause constipation. If the constipation is relatively mild, you should stop drinking black tea, and do a good job of dietary regulation, such as eating a diet rich in dietary fiber content of food, after a period of time can be improved.