Delayed menstruation is not a cause of anemia and anemia does not occur. Anemia may alter menstruation and cause irregular periods, resulting in shorter periods and reduced menstrual flow. Anemia not only makes menstruation irregular, but also causes other diseases. If there is a suspicion in this regard, you can draw blood for routine blood tests. Under normal circumstances, hemoglobin is 110-150g/L, and if it is less than 110g/L, it can be diagnosed as anemia. Frequent excessive menstruation and prolonged menstruation are one of the reasons for the occurrence of anemia, so actively search for the cause of anemia and treat the cause. If the anemia is not serious, you can adjust the diet, eat more high-protein food, cooking with iron pot, and oral ferrous sulfate, blood oral solution, etc., and eat more fresh vegetables, fruits, meat and vegetables, so as to achieve reasonable nutrition.