The answer to 'why is my bed bug odor' is that bed bugs release a distinctive sweet, musty odor when they are present. This odor is caused by the chemicals they release, which can be detected by their natural predators as well as by humans.
The odor is often described as similar to the scent of coriander, rotten fruit, or almonds. The more bed bugs that are present, the stronger the odor will be. Noticing this odor can be an early sign of a bed bug infestation in your home.