Sweating of the legs and no sweating of the upper body at night is mostly caused by yin deficiency and night sweating or upper cold and lower heat. According to the basic theory of traditional Chinese medicine, yin deficiency generates heat, yin deficiency and hyperactivity of yang, the night is yin, yang energy into the inside, internal heat aggravation, heat forced sweating. Thus, it is manifested as sweating on the legs and no sweating on the upper body, but it can also be manifested as sweating on the whole body.
In addition, it may also be caused by upper cold and lower heat, that is, on the one hand, the cold evil sensation in the upper, and see the cold (cold), nausea and vomiting, white tongue, etc.; on the other hand, the heat evil knot in the lower, and see abdominal distension, constipation, lower limbs sweating and other symptoms. On the other hand, if the heat is concentrated in the lower part of the body, abdominal distension, constipation and sweating in the lower limbs will be seen. Therefore, if the upper part of the body is cold and the lower part of the body is hot, sweating in the lower limbs will be seen.
If you have any of the above symptoms, it is recommended to seek medical advice and be guided by a doctor.