How your feet look when you wearing high heels!
The higher the heel, the pressure gets shifted forward, and the more weight. Your knees and hips then have to push forward and your back has to hyperextend backward to counterbalance. This can translate to the leg, hip, and back pain. It misaligns the whole skeletal system and that's in a nutshell why it's really bad for you.
Similarly to how overusing muscles can lead to injury, frequently wearing high heels can cause all sorts of painful problems. Straining your ankles and other tendons surrounding the foot can lead to tendonitis.
What ends up happening with overuse is the fat pad on the bottom of the foot starts to become a lot thinner over time. When you don't have a natural cushion anymore, You can get generalization pain on the bottom of the foot. This pain is called Metatarsalgia.