Sweaty underarms clothes are always wet, may be related to hyperhidrosis, may also be related to fox odor. 1. Hyperhidrosis is a phenomenon caused by over-exuberant secretion of local sweat glands, and is divided into two types of physiological factors and pathological factors from the point of view of the cause. (1) physiological factors caused by excessive sweating, mainly seen in the environment temperature is too high, after strenuous exercise, emotional tension and so on. (2) Pathological factors are mainly seen in patients with hyperthyroidism, pregnant women, diabetes and pituitary hyperfunction patients, etc., due to the body’s hormone secretion level is abnormal, so it is easy to lead to localized excessive sweating. 2. Fox odor is also called stinky sweat, is due to the armpit sweat gland structure abnormality and lead to a kind of disease, in addition to the manifestation of excessive sweating, will be accompanied by a special odor. Underarm sweating phenomenon, first of all, pay attention to hygiene, and secondly, pay attention to change clothes, for accompanied by the odor of sweat, must be timely medical treatment.