The hot summer climate, or sweating after exercise, is a normal physiological phenomenon. However, some people do not sweat in all seasons, even if it is intense exercise or the temperature reaches 38 degrees Celsius or more, or after a “big surprise” there is no sweating feeling, what is the reason? It turns out that a little or no sweat on the skin surface can be caused by abnormalities in the sweat glands themselves or a level of abnormal neural pathways, the main causes of which are: 1, congenital sweat gland dysplasia or lack of sweat glands, which can be manifested as generalized or restricted sweating. 2, certain skin diseases, such as severe ichthyosis, scleroderma, leprosy, radiation dermatitis, skin atrophy, etc., can cause restricted anhidrosis. 3, nerve injury, such as transverse myelitis, pediatric paralysis, paraplegia, local injury to sympathetic nerve, medulla oblongata, pontine brain, can cause generalized or restricted anhidrosis. 4, certain visceral disorders, such as diabetes, uremia, chronic nephritis, mucinous edema, malignant tumors, etc. In addition, vitamin A deficiency, etc., can also cause generalized anhidrosis. In summer, people with generalized anhidrosis cannot regulate their body temperature and are prone to heatstroke. Sweating has other important roles besides heat distribution: 1. Sweat can maintain the physiological balance of water supply and evaporation and prevent the skin stratum corneum from drying out. 2, sweat has an acidifying effect on the skin surface, defending against microbial attack. 3. Sweat and sebum emulsify each other and form lipid films on the skin surface. In addition, it is also related to the metabolism of electrolytes, mucopolysaccharides, and hormones. Therefore, patients with anhidrosis should seek medical attention as soon as possible. A combination of treatments can be used to alleviate the patient’s suffering. Currently, anhidrosis is untreatable except in cases of congenital sweat gland dysplasia; if the anhidrosis is caused by other disorders, the primary disease should be actively treated. Those with extreme physical discomfort can be relocated to a low temperature area or artificially cooled, such as by installing air conditioning indoors. Chinese medicine also has its own unique approach to sweatlessness: 1. Internal treatment method (1) Yin fluid loss type —- due to congenital deficiency, or heat illness injury to Yin, intolerable in summer, dry mouth and throat, stool like sheep dung, red tongue with little moss and fine pulse. Treatment is to nourish yin and generate fluid, nourish and benefit the sweat source method. Herbs: Radix Rehmanniae Praeparata 30g, Radix Maldonae 10g, Rhizoma Polygonatum 10g, Rhizoma Pinelliae 10g, Radix Astragali 10g, Radix Puerariae 10g, Radix Angelicae Sinensis 10g, Radix Salviae Sinensis 10g, Fructus Schisandrae 10g. Decoction with water, 1 dose daily, divided into two doses. (2) Yang deficiency and Qi weakness type —- due to congenital deficiency, or long-standing illness and weakness, sweat overflow reduction, cold form and limbs, waist and knee soreness, dry skin, light tongue with little moss, thin and weak pulse. The treatment is to benefit Qi and strengthen Yang, nourish the skin method. Medicine: Cistanches 20g, Lock Yang 10g, Deer horn cream 30g, Astragalus 30g, Radix Codonopsis 15g, Radix Rehmanniae 30g, Rhizoma Polygonatum 60g, Rhizoma Atractylodis 15g, Rhizoma Polygonatum 15g. Decoction with water, 1 dose daily, divided into two doses. 2, diet therapy (suitable for the summer heat) (1) 60g of mung beans, 80g of round-grained rice, 20g of sugar, boil porridge. (2) watermelon rind (remove the green coat and flesh) 60g, sliced and boiled water, drink as tea. (3) 10g of green tea, 15g of mung bean coat, make tea.