The phenomenon of hypothermia in early pregnancy can be caused by physiological factors of clinical manifestations, or due to pathological factors caused by changes in the condition, need to be based on the etiology of the cause of hypothermia in pregnant women to determine the specific circumstances. If the female patient has always had hypothermia before pregnancy and has a family history of hypothermia, hypothermia is a normal physiological phenomenon and a clinical symptom caused by the individual’s constitution. If the female patient’s body temperature was normal before pregnancy and did not rise significantly after pregnancy, especially when accompanied by abdominal pain, vaginal bleeding and other medical conditions, it is considered to be due to the low secretion of hormones in the body caused by the preeclampsia, resulting in hypothermia, due to pathological reasons, and need to be diagnosed and treated in a timely manner.