There is an unpleasant smell after touching your armpit, which is the first sign of body odor. Sweat under the armpit is sticky and underwear stinks and turns yellow, which is the second sign of body odor. Sweat is salty after sweating, which is the third sign of body odor. There is a white or yellowish secretion smell on the armpit hair, which is the fourth sign of body odor.

Suggestions: Do less excessive exercise, eat less irritating food, smoke less, drink less, live a regular life and be emotionally stable.