The Ballet Flat — There's a reason why foldable, easy-to-carry flats are so popular. Flats offer basic support, more balance, and less strain on the lower leg, says Wharton. For everyday use, they are a fairly safe bet, but there may be a downside to what you consider to be your "sensible" or "comfortable" shoes. As Dr. Novella explains, those who are devoted heel lovers can actually experience discomfort when they suddenly slip into flats all day. "People who are used to heels can experience plantar fasciitis or strain of the band, which supports the arch," he explains. In addition, because of the shape of the shoe, toe movement may be restricted, causing pressure on the sides of the foot and eventually could lead to bunions.

One solution may be to choose a wide toe-box flat that will prevent any toe crunching, or simply being more aware of toe restraint when selecting a new style. We're not advocating a life-long square-toe-only shoe collection, but do think about introducing some variety. A few cushioned flats to throw on whenever your don't need to wear something fancy can certainly help, as well.