We often find in the clinic that the mother suddenly leg swelling and pain during the sitting period, to the hospital is the lower extremity of deep vein thrombosis, deep vein thrombosis can be dislodged and cause pulmonary embolism and death, known clinically as the “invisible killer”, but why the mother will be no signs of the lower extremity of deep vein thrombosis? This makes the patient puzzled, and also makes the family busy with the baby busy with the mother, busy with the mess. In the peripheral vascular surgery clinic, there are indeed many cases of lower limb deep vein thrombosis in mothers and pregnant women, so why does lower limb deep vein thrombosis favor mothers (pregnant women) so much? Blood is slow. Women gain weight after pregnancy and are prone to varicose veins in the lower extremities. After delivery, the enlarged uterine body has not recovered, and the traditional habit of sitting on the moon makes women stay in bed for a long time, especially after cesarean section and childbirth surgery (such as lateral incision or birth injury), the women stay in bed for a long time and reduce their activities on the ground, which directly affects the blood flow back to the lower extremities of women and creates conditions for the formation of deep vein thrombosis in the lower extremities. This directly affects the blood return to the lower extremities, creating conditions for the formation of deep vein thrombosis. Some mothers have increased physiological compression of the left common iliac vein by the bifurcation of the abdominal aorta, or have abnormal development of the iliac vein, which is also a common cause of slow venous flow in the left lower extremity. The hypercoagulable state of the blood is an important factor in the formation of deep vein thrombosis. During the puerperium, certain coagulation factors increase significantly, and the hypercoagulable state of the blood facilitates the rapid formation of thrombus on the placental abruptive surface in the uterus to reduce bleeding on the one hand, but on the other hand, it may also be a factor in the formation of pelvic vein thrombosis. Maternal obesity, gestational hypertension, renal disease and cesarean surgery are all factors that produce blood hypercoagulation. Vascular injury The intact intima is a barrier for platelet aggregation and can produce prostacyclin and endothelial diastolic factors that have strong vasodilatory and platelet aggregation inhibiting properties, and these changes occur once the intima of the vein is injured. At the same time platelets synthesize increased thromboxane A2 with strong vasoconstrictor and hyperaggregating platelets and will initiate exogenous coagulation system to increase the hypercoagulable state of blood. At the end of pregnancy and puerperium, there are multiple factors of vascular damage, such as compression of the enlarged uterus, pelvic congestion, inflammation and infection. The above three factors causing deep vein thrombosis must exist during women’s pregnancy and delivery, therefore, the number of patients with lower extremity deep vein thrombosis during the menstrual period is significantly increased. During pregnancy, the risk of deep vein thrombosis is five times more than that of non-pregnant women, and there is another significant increase during the puerperium and after cesarean section, and the majority of women are discharged from the hospital several days after delivery, while this disease usually occurs between 1 and The majority of mothers are discharged from hospital a few days after delivery, and the disease usually occurs between 1 and 3 weeks after delivery, so it is also clinically known as “puerperal deep vein thrombosis”. To prevent lower limb deep vein thrombosis after delivery, pregnant women should change the traditional way of “sitting on the moon” and avoid sitting and lying down for a long time. You should get up and move around on the second day after delivery, and lying in bed completely is not advisable. If you have difficulty moving around, you should move your lower limbs in bed frequently to avoid deep vein thrombosis in the lower limbs. It is also unscientific to over-nourish a woman after delivery. If she over-eats high protein, high fat, high sugar and highly stimulating ginger food after delivery, it will increase the blood viscosity and slow down the blood flow in the lower limbs. Therefore, women should be encouraged to drink more water, eat a diet low in sugar, high in fiber, high in protein, high in calcium and moderate in fat, eat more fresh vegetables and fruits, and forbid spicy and stimulating foods. If a woman finds swelling and pain in her lower limbs, she should not be careless and should go to a regular hospital for vascular surgery in time to avoid life-threatening pulmonary embolism caused by delayed medical treatment.