Drain flies, also known as moth flies or sewer flies, are small, fuzzy insects that are commonly found near drains, sinks, and other damp areas. While they do not pose a direct threat to humans, they can be a nuisance when they infest homes or other structures. They can breed quickly and their larvae can cause blockages in drains and pipes, leading to water damage and other problems. In addition, their presence can be unsightly and cause anxiety or discomfort for some people.