Patients are afraid of heat mainly for physiological reasons as well as pathological reasons, as follows: I. Physiological reasons: mainly people are not able to tolerate heat, especially when the weather is hot, they will be afraid of heat. Because after overheating will cause the internal organs of the body to run slowly, resulting in uncomfortable symptoms, which is also the reason why people are easily afraid of heat. In addition, there are some obese patients because the body fat content is relatively high, the symptoms will be more obvious in hot weather. Second, pathological reasons: patients have some diseases, like hyperthyroidism or plant nerve disorders, resulting in abnormal neural regulation in the body, the phenomenon of easy to be afraid of heat, and sweating more. For this situation, patients need to be given timely anti-hyperthyroidism, as well as nerve-related medication to reduce symptoms.