The defining feature of ORS is excessive thoughts of having offensive body odor(s) which are detectable to others. The individual may report that the odor comes from: the nose and/or mouth, i.e. halitosis (bad breath); the anus; the genitals; the skin generally; or specifically the groin, armpits or feet. The source(s) of the supposed odor may also change over time. There are also some who are unsure of the exact origin of the odor. The odor is typically reported to be continuously present. The character of the odor may be reported as similar to bodily substances, e.g. feces, flatus, urine, sweat, vomitus, semen, vaginal secretions; or alternatively it may be an unnatural, non-human or chemical odor, e.g. ammonia, detergent, rotten onions, burnt rags, candles, garbage, burning fish, medicines, old cheese. Again, the reported character of the odor complaint may change over time. Halitosis appears to be the most common manifestation of ORS, with 75% complaining of bad breath, alone or in combination with other odors. The next most common complaint was sweat (60%).