Silverfish are small, wingless insects with shiny, silvery-gray bodies shaped like teardrops. They move with a quick, fish-like wiggle, which is how they got their name. Usually about half an inch long, these nocturnal pests hide during the day and come out at night, often found in bathrooms, kitchens, basements, and attics — anywhere damp and dark.

Though harmless to humans, silverfish can cause real damage in your home. They feed on starchy and sugary materials like books, wallpaper glue, fabric, and pantry staples such as flour and cereal. Over time, they can ruin clothing, upholstery, and even important documents. Their presence is also a warning sign of excess moisture, which can lead to mold growth or attract other pests.

Preventing an infestation starts with reducing humidity. Use dehumidifiers, repair leaky pipes, and improve ventilation in damp spaces. Sealing cracks and crevices in walls and baseboards can cut off their hiding spots, while keeping food, clothes, and paper items in airtight containers removes their main food sources. Regular cleaning and decluttering also make your home far less inviting to them.

In short, while silverfish don’t bite or spread disease, ignoring them could mean costly damage to your belongings. Treat their appearance as a signal to check your home’s moisture levels and act quickly with prevention steps. With a few changes, you can stop these persistent pests from turning your home into their playground.