In addition to blood, menstrual blood contains fragments of the endometrium, mucus from the cervix, and shed vaginal epithelial cells. Menstrual blood contains prostaglandins and a large amount of fibrinolytic material from the endometrium, which causes menstrual blood not to clot. However, when there is a lot of bleeding, blood clots may appear. This fleshy stuff is considered to be large endometrial fragments and glands, which is normal and does not require treatment. During menstruation, you should pay attention to rest, avoid getting cold, pay attention to diet, eat less cold, stimulating food, especially in the premenstrual period to pay attention to abdominal warmth, abdominal pain, itching, odor should promptly go to the hospital for examination. If you have something like a blood clot every menstrual period, you should also go to the hospital for further examination.