The color and pattern of menstrual blood can reflect the status of a woman’s hormone levels to some extent. Hormone levels are constantly changing during a complete menstrual cycle, and the color and consistency of menstrual blood are affected accordingly. If the menstrual blood is bright red or dark red, with a slight reddish-brown color in the last days of the period, it is generally normal and not a problem. Many women have observed that menstrual blood is sometimes thicker or accompanied by clots and may be bright red in color or dark red or blackish. This usually occurs on the days when menstrual flow is heaviest. During menstruation, the body releases anticoagulant substances to facilitate the smooth discharge of menstrual blood. When the menstrual flow is high, the anticoagulant substances do not have enough time to work and clots may appear and feel darker in color. Usually these are normal, not some kind of Qi stagnation and blood stagnation, and do not need additional regulation. However, if this condition lasts too long and the menstrual flow is too heavy, it may be an endometrial polyp and should be checked by a gynecologist as soon as possible. During the period of endometrial proliferation, the level of estrogen in the body increases, which can thicken the endometrium. However, if the endocrine disorder and estrogen levels are too high, it may over-stimulate the endometrium and lead to endometrial polyps. Some gynecological inflammatory diseases may also cause this problem. Endometrial polyps tend to occur in women over 35 years old, with a peak age of 50 years old.