The answer to 'why is my gutter odor' is that a foul smell in your gutters is usually caused by the buildup of organic debris, such as leaves, twigs, and other plant matter. As this material decomposes, it can release unpleasant odors that can permeate your home. Gutters that are not properly maintained or cleaned on a regular basis are more prone to developing these types of odors.
The symptoms of a gutter odor problem include a strong, musty smell coming from your gutters, potentially accompanied by visible debris or discoloration. If left untreated, the odor can worsen over time and may even attract pests like mosquitoes or rodents to the area.