Cold sweat on the outside of the thighs may be caused by physical weakness, autonomic nervous system dysfunction, mental overstress and other reasons. 1. Physical weakness: cold sweat on the outer side of the long thighs may be caused by a long period of non-exercise and a weaker physical condition. Patients will have bouts of cold sweat on their thighs after occasional exercise in their lives because of the body’s yin and qi deficiency and when they suddenly engage in some kind of stressful behavior. By exercising, you can improve your immunity, thus improving the symptoms of cold sweat. 2. Phytoneurological disorders: Cold sweats on the outer thighs can be caused by autonomic dysfunction due to poor body regulation. 3. Excessive mental tension: it may be caused by the abnormal performance of the body after a high degree of mental tension, which can be adjusted by breathing heavily, mental suggestion method and detachment from the crisis environment to alleviate the cold sweat on the outer thighs. Cold sweat on the outside of the thighs has a variety of possible causes, it is recommended that patients go to the hospital to listen to the doctor’s advice, specific judgment of the type of disease, so as to better treatment to alleviate the symptoms.