Yellowing of sweat under the armpits may be caused by physiological factors such as diet and bad habits, or by disease factors such as chromhidrosis and armpit odor. Under normal circumstances sweat is colorless, when eating too much carrots, citrus and other foods containing carotene, etc., can lead to a higher concentration of carotene in the blood, sweating yellow. Some people with poor living habits, sweating a lot, not timely cleaning clothes, armpit sweat and some substances in the air to react, the color yellowing. There are also part of the population armpit sweat yellowing for disease factors, such as color sweating in the sweat gland color sweating, mostly limited to the armpits. The combination of axillary hyperhidrosis and axillary hyperhidrosis can give off a peculiar odor. The specific cause is recommended to consult a doctor for examination and diagnosis by a professional doctor.