Before the armpit does not smell now have with bad hygiene habits, followed by may also be the fox odor, hyperhidrosis and other diseases caused by. 1. bad hygiene habits: if you do not pay attention to personal hygiene, armpit sweating is not treated in time, may lead to local odor, which led to the previous armpit did not taste now have. 2. Fox odor: Fox odor is the special odor produced by bacterial decomposition of sweat gland secretions in the top of the armpit, the etiology of heredity, strenuous exercise, hot and stuffy weather, etc., characterized by the emission of a special pungent odor, more pronounced in the summer after exercise. 3. Hyperhidrosis: the former underarms do not smell now may also be caused by hyperhidrosis, to the palms of the hands, armpits and other parts of the common, if not timely cleanup, may lead to local odor. There are more reasons why the armpits didn’t smell before and now there is an odor, so it is recommended to consult a doctor for examination.