Everyone has experienced underarm odor at some point in their lives. This occurs when your armpit gets warm and moist, which make them ideal hosts for bacteria. Odor-causing bacteria thrive in moisture, and is worsened by being trapped in hair and unbreathable clothing fibers.
There are millions of sweat glands throughout your body, which are either the eccrine or apocrine glands. The culprit for body odor are often your apocrine glands, which are found in your armpits and groin. When sweat is emitted from the apocrine glands and come into contact with the bacteria on your skin, you will experience unpleasant smells.