Women always sweat at night in winter, the common causes are environmental factors, qi and blood deficiency, yin deficiency and so on. 1. Environmental factors: the northern winter due to lower temperatures, indoor heating temperature is too high, or the quilt is too thick. Sweating is easy when you sleep, which can be improved by adjusting the indoor temperature and covering less blankets. 2. Qi and blood deficiency: Due to the special characteristics of women’s bodies, many women suffer from Qi and blood deficiency, which leads to sweating after sleeping at night in winter. 3. Yin deficiency: If a woman has a deficiency of Yin, it may lead to night sweats (abnormal sweating after going to sleep, but sweating stops after waking up), resulting in winter night sweats. Women who experience winter night sweating, after excluding environmental factors, should be under the guidance of a professional doctor for standardized treatment.