Fire appears when you take off your sweater at night, is this static electricity? How does it affect people?

It is static electricity. Negative impact on human health. There have been medical experts have confirmed that the skin electrostatic interference can change the normal potential difference between the human body surface, affecting the normal electrophysiological process of the heart muscle. This static electricity can make the patient aggravate the condition, persistent static electricity will also make the blood alkaline elevated, resulting in itching, pigmentation, affecting the physiological balance of the human organism, interfere with human emotions. Especially the elderly, the skin is relatively young and dry as well as the aging of the cardiovascular system of the elderly, anti-interference ability to weaken and other factors, the elderly are more susceptible to the effects of static electricity. Cardiovascular system would have had a variety of lesions of the elderly, static electricity will make their condition worse. Excessive static electricity also often make people restless, headache, chest tightness, breathing difficulties, coughing and so on.