According to the pregnant women afraid of heat to judge pregnant is a boy or a girl is no scientific basis, afraid of heat has nothing to do with the birth of a boy or a girl, and the state prohibits fetal sex identification. Pregnant women afraid of heat can be seen in physiological, but also can be seen in pathological reasons, such as infection, hyperthyroidism, obesity and so on. 1. Physiological reasons: normal healthy people in pregnancy metabolism is more vigorous, there can be the phenomenon of heat exhaustion, as well as such as in the high temperature environment, wearing too much clothing, mental stress and other conditions may occur under the phenomenon of heat exhaustion, is normal physiological, and has nothing to do with the birth of a boy or a girl. 2. Infection: such as acute upper respiratory tract infections, lung infections, etc. can appear fever phenomenon, and then the phenomenon of fear of heat, but generally accompanied by other symptoms, such as nasal congestion, sore throat, headache, dizziness, cough and so on. 3. Hyperthyroidism: if there is hyperthyroidism, resulting in increased secretion of thyroxine, which in turn promotes the body’s metabolism, the phenomenon of fear of heat, but generally accompanied by lethargy, drinking, eating, sweating, irritability and other symptoms. 4. Obesity: the human body during pregnancy under the stimulation of hormones are prone to fattening, such as itself is relatively fat, there will be the phenomenon of obesity during pregnancy, obese people have more fat, good insulation, poor heat dissipation, so it is easy to fear of the phenomenon of heat. In addition, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease to give targeted treatment or treatment, and boys and girls have nothing to do with, such as pregnancy need to be timely medical pregnancy checkups and archives.