The difference between underarm odor and body odor is that they cover different scopes; body odor is a type of underarm odor, and underarm odor refers to a wider range of odors. Underarm odor is a collective term for a variety of odors emanating from the armpits. Armpit odor, commonly known as “fox odor”, is caused by unsaturated fatty acids produced by the interaction of various bacteria in the armpits with organic substances contained in the secretions of the parietal sweat glands. Armpit odor includes fox odor, which is a manifestation of underarm odor. Most of the underarm odor is caused by not taking a bath in time, which leads to fermentation of sweat and bacterial decomposition of organic substances in the sweat to emit the odor, including the odor of fox due to the vigorous secretion of sweat glands. Fox odor is a disease in which the sweat glands in the armpits secrete exuberantly and the bacteria multiply, breaking down the organic matter in the sweat to emit a fox-like odor. If underarm odor occurs frequently and does not go away even if you take frequent baths and change clothes, it is recommended to consult a doctor in time for examination and treatment.