The causes of coldness in second pregnancy are physiological and pathological. 1. The physiological causes of coldness in pregnant women are mainly due to the relative increase in body temperature in the first trimester of pregnancy due to the warming effect of progesterone, which does not adapt well to the low temperature in the external environment, resulting in the symptoms of coldness, which will disappear after the third trimester. 2, The pathological causes of coldness in pregnant women are mainly pregnancy complications during pregnancy, common causes such as gestational hypothyroidism, gestational iron deficiency anemia, and gestational severe osteoporosis. Pregnant women should go to the obstetrics department of a regular public hospital as soon as possible for further examination and diagnosis, and then for targeted management.