It is normal to have a small amount of blood clots during menstruation. Women have dark red non-clotting blood during menstruation, which contains not only blood, but also fragments of the endometrium as well as vaginal epithelial cells and cervical mucus. If the bleeding is heavy or fast, clots may form. However, if the clots are heavy, dysmenorrhea or the color of menstrual blood is dark, blood stasis caused by cold can be excluded. During menstruation, you should pay attention to keep warm, forbid cold, spicy and stimulating food, eat a light diet, drink nutritious porridge, eat some seasonal fruits and vegetables, and keep a happy mood.