Menstrual cramps in the lower abdomen, mainly due to pelvic congestion and uterine contraction, if the situation is not serious, is normal, but also may be related to the following factors: 1, may be related to abdominal cold, female friends due to underdressing, the abdomen is easy to get cold, the formation of stagnation of qi and blood, dysmenorrhea, obviously accompanied by lower abdominal cramps. 2, due to overworked, in the period of menstruation was relatively weak, need more nutrition and rest. Need more nutrition and rest, if overwork or physical activity, will lead to excessive menstrual bleeding caused by small abdominal pain. 3, related to diet, if the menstrual period to eat spicy, cold, cold food, will also lead to qi and blood stagnation small abdominal pain. Therefore, during menstruation should not do strenuous exercise, should not wear tight pants, should not eat spicy, cold food, pay attention to warmth, to avoid the uterus cold.