Doctors say, between stilettos versus comfy flip-flops, high heels are actually the lesser of two evils. The American Podiatric Medical Association says flip-flops can cause tendinitis and even sprained ankles because they provide the foot with very little protection. And the lack of support in a flip-flop causes the arch to flatten……which can lead to plantar fasciitis and heel pain. But typically, high heels have arch support. So if you want to enjoy your flip-flops, doctors say: Wear them for only about two hours at a time, then find something else that’s sturdier.