Sudden odor in the armpit, on the one hand, is caused by poor cleaning, on the other hand, is suffering from fox odor and other diseases. 1. poor cleaning: especially in the summer heat, if the exercise is larger, sweating more, spicy diet, and at the same time do not pay attention to personal hygiene, long time not clean, will lead to sweat concentration and local fermentation, breeding bacteria and other microorganisms, resulting in armpit suddenly odor, odor will become more and more intense. 2. Fox odor: Fox odor people usually top secretion sweat glands large volume and number. If there is a sudden odor in the armpits, it may be that the people who have bad breath have entered puberty, because there may be no odor when they are young, and the odor will be gradually aggravated when they enter puberty. There may also be a mild case of halitosis, in which the odor is usually not very noticeable under normal circumstances, but the symptoms of halitosis will worsen after strenuous exercise. In conclusion, if there is a sudden odor in the armpits, it is recommended to take a shower and change clothes regularly. If the odor persists for a long time and affects your life, you can consult a doctor in time to have the odor treated by surgery.