The answer to 'stink bug swarms' is that stink bugs are common household pests that can gather in large numbers, especially in the fall as they seek warm places to overwinter. Stink bug swarms are caused by the bugs congregating on the exterior of homes and buildings, often attracted to light or seeking shelter. Symptoms include seeing large numbers of the brown, shield-shaped insects on the outside of your home, as well as potential infiltration indoors.
For homeowners dealing with stink bug swarms, some DIY solutions include sealing cracks and crevices on the exterior of your home, using insecticidal sprays or dusts around entry points, and setting up traps or vacuums to remove the bugs. However, for severe infestations or if the bugs have already made their way inside, it's best to call in a professional pest control technician who can properly identify the species, assess the extent of the problem, and implement more comprehensive treatment.