The symptoms of cold and hot in early pregnancy may be caused by the following factors: 1. It may be caused by the low level of estrogen in the pregnant woman’s body after pregnancy, resulting in disorders of the plant nervous function, which is a normal phenomenon. 2. It is related to the fever of the pregnant woman, if the upper respiratory tract infection occurs in early pregnancy, it will lead to an increase in the patient’s body temperature, and in the process of rising body temperature. The above symptoms will appear in the process of temperature rise, so it is recommended that pregnant women should measure their body temperature in time to clarify whether it is caused by fever factors. 3, may be caused by the patient’s mental factors, if the spirit is too nervous after pregnancy, there may also be symptoms of sudden cold and heat. If the patient has no other abnormal symptoms, it is generally normal. If accompanied by other symptoms, it is recommended to consult a doctor at the hospital.