One, fever and cold. When you have a fever and cold, it is normal for your body to be hot and cold, because the temperature in your body is not stable, and some nausea, general lack of energy, always like vomiting, these are the symptoms of fever, cold, or severe flu, can also trigger this situation. Second, the signs of pregnancy. Some women in the early stages of pregnancy, you will have this reaction, because just pregnant, the body can not fully adapt. Third, the female physiological factors, if you are in the physiological period these days, then there is this situation, is also normal, we suggest to observe and observe again.