Menstruation for more than 10 days and prolonged menstruation may be related to qi deficiency, internal heat in yin deficiency, dampness-heat accumulation (damp and heat evils gather each other in the body), blood stasis and other factors. Specifically, it is necessary for a professional physician to make a comprehensive judgment according to the patient’s situation. Prolonged menstruation means that the menstrual cycle is basically normal but the menstrual period lasts more than 7 days, or even half a month, or is accompanied by increased menstrual flow. If the patient’s menstrual blood is prolonged, heavy, pale in color and thin in texture, and accompanied by tiredness, shortness of breath and laziness, a drop in the abdomen, and a whitish complexion, it is generally regarded as a manifestation of qi deficiency. If the patient’s period is prolonged, scanty, bright red and thick; and accompanied by dry throat and mouth, or hot flashes (a burst of heat), red cheeks (cheekbones reddish color), or hot hands and feet, etc., it is generally considered to be a manifestation of Qi deficiency. It is generally considered to be a manifestation of Yin deficiency and internal heat. If symptoms of prolonged menstruation occur, it is important to consult a doctor and follow medical advice.