Sweating in summer, because the weather is hotter, the body needs to regulate the temperature can keep the body temperature to produce a certain thermostat. Then the winter cold and peeling phenomenon, nervousness when sweating will be more, this is why? Because the slightest stimulus will lead to sympathetic nerve excitement, for example: emotional tension, excitement, feel the pressure and so on. There are also a lot of sweating caused by diseases caused by the hands and feet, hyperthyroidism, diabetes, hypertension and other diseases caused by. This aspect needs specific examination to determine. Always cold and sweaty hands and feet, may be caused by hyperhidrosis. People with hyperhidrosis have colder hands and feet and sweat more than the average person. Generally speaking, most young people have hyperhidrosis, and the symptoms of hyperhidrosis are more obvious when they are emotionally excited or nervous. Therefore, people suffering from hyperhidrosis should try to avoid emotional fluctuations and not be too nervous.