There are many reasons why summer underarm sweating makes clothes turn yellow, specifically as follows: first of all, summer underarm sweating makes clothes turn yellow, it may be due to congenital axillary sweat glands developed, congenital axillary sweat glands developed patients will secrete a large amount of sweat in the summer, the sweat contains a certain amount of lactic acid and organic salts, which can easily lead to the symptoms of yellowing of the clothes. Secondly, the cause of summer underarm sweating, clothes turn yellow, may also be due to liver and gallbladder diseases, such as liver and gallstones, acute and chronic hepatitis. These liver and gallbladder diseases will cause the human body’s liver function to decrease, and make the human body’s bilirubin, bile concentration in the blood increase, and through the human body sweating excretion, which leads to the human body to appear when sweating clothes turn yellow symptoms. Then, summer underarm sweating makes clothes yellow, also can not be ruled out due to the role of drugs, which take rifampicin, riboflavin, primaquine drugs, patients, the summer underarm sweating makes clothes yellow symptoms are particularly obvious.