The resistance of a woman’s body decreases when she is menstruating, and her gastrointestinal function is weakened accordingly. If you drink a cola at this time, the acidity in the cola will probably lead to an increase in the acidity in the stomach, which will damage the gastric mucous membrane and cause gastric pain symptoms. The carbon dioxide released from cola can easily cause bloating and gastrointestinal dysfunction. Moreover, cola is a carbonated beverage, and the phosphoric acid contained in carbonated beverages can reduce the absorption of calcium and iron in the human body, aggravating the loss of iron during the menstrual period of women, which may lead to the symptoms of calcium and iron deficiency in the human body, or cause iron-deficiency anemia in women. And cola contains caffeine, in addition to the gastrointestinal tract will cause stimulation caused by intestinal cramps, if long-term overdrinking, it is likely to lead to chronic gastritis, as well as prompting the central nervous system excitation, leading to sleep system disorders, and even make people irritable.