Women drinking coffee will affect menstruation for the following reasons: First, coffee is a stimulating drink, women taking it will lead to accelerated pelvic blood circulation, resulting in increased menstrual blood, prolonging the period, thus affecting menstruation. Second, women in drinking coffee will stimulate the nervous system, leading to insomnia, if there is a hormone level disorder, will also affect the menstrual changes, women should pay attention to proper rest during menstruation, in the diet to eat more blood, nutritious food, is conducive to replenish the loss of nutrients due to menstrual blood outflow, conducive to physical recovery. Women should pay attention to avoiding cold and flu during menstruation, which is helpful to help the body recover.