One side of the armpit has a flavor and one side does not have with poor hygiene habits or armpit odor, hyperhidrosis and other diseases. 1. poor hygiene habits: if personal hygiene habits are poor, armpit sweat is not wiped clean in time, or only wipe one side, the local sweat will produce odor, thus appearing on one side of the armpit smell on the other side of the situation. 2. Armpit odor: the cause of armpit odor is related to heredity, in addition to hot weather, strenuous exercise will lead to sweating, making armpit odor aggravated. Some patients may only have armpit odor on one side, which may cause one side of the armpit to smell and the other side not. 3. Hyperhidrosis: the smell of one side of the armpit and the other side does not may also be caused by hyperhidrosis, hyperhidrosis is divided into localized and generalized type, localized hyperhidrosis is common in the palms of the hands, soles of the feet, armpits and other parts of the body, due to the accumulation of sweat, followed by bacterial infections, there may be a bad smell. There are more reasons why one side of the armpit smells and the other side doesn’t, so it is recommended to consult a doctor for examination.