The answer to 'spider swarms' is that spider swarms are usually caused by a large population of spiders, often due to an abundance of food or ideal breeding conditions. Symptoms include seeing large groups of spiders congregating together, which can be alarming to homeowners. Solutions depend on the severity of the issue, but may include removing food sources, sealing entry points, and using targeted pesticide treatments. In most cases, it's best to call a professional pest control technician to properly diagnose and address a spider swarm, as improper DIY methods can be ineffective or even dangerous.
Spider swarms are relatively uncommon, but can occur in certain situations. They are usually a sign of a larger spider population in the area, and should be addressed promptly to prevent further spread and potential risks to the home and occupants.