The answer to 'why is my spider odor' is that you may be experiencing the unpleasant scent of a spider infestation. Spiders, particularly certain species like the brown recluse or black widow, can release a distinct odor as a defensive mechanism when they feel threatened. This pungent, musty smell is often described as similar to rotting wood or a damp, moldy smell.
The spider odor is typically caused by the secretion of pheromones and other chemicals from the spider's body. The smell can linger in areas where spiders are nesting or congregating, such as dark corners, attics, or basements. While not harmful to humans, the odor can be quite unpleasant and a sign that you have a spider problem that needs to be addressed.