Aunt refers to menstruation. If there is only a small amount of blood clots during menstruation, it is a normal phenomenon. If there are a lot of blood clots, accompanied by menstrual cramps and other symptoms, it is not normal, and may be caused by adenomyosis, endometrial polyps, endometritis and other diseases, which need to be specifically analyzed. 1. Small amount of blood clots: generally because of heavy bleeding during menstruation, fast, easy to appear clots, is a normal physiological phenomenon, do not be too nervous. 2. A large number of blood clots, accompanied by dysmenorrhea: patients with adenomyosis, endometritis, endometrial polyps, the intrauterine environment changes, the bleeding is more, easy to form clots, the duration is longer, accompanied by at the same time can be accompanied by dysmenorrhea and other discomforts. There may be other reasons for blood clots during menstruation, such as endocrine diseases, endometrial cancer, cervical cancer, etc. It is necessary to go to the hospital for examination, to exclude organic lesions, and to carry out treatment under the guidance of the doctor.