If you were to look at the feet of most people, you’d see a noticeable upward arch at the bottom of the foot.
The arch in your foot looks the way it does because tendons (strong, tight bands that attach the heel and bones of the foot) tense and flex as they maintain the right amount of pressure to keep your body well balanced and mobile.
For those who suffer from flat feet, their tendons do not do this. This can mean people with flat feet often suffer from cramps, aches and fatigue, as the arches of their feet are always flat to the ground rather than flexed.
There are lots of reasons for having flat feet, most of them are extremely common.
Some people have flat feet because of their genetics. Flat feet can run in families, and it’s simply a matter of a few different genetic factors coming together.
Some people who suffer from flat feet do actually have an arch in their foot, but it is only visible when they are sitting. Once weight comes down on the foot, the arch can no longer support itself, and so the foot flattens against the ground.
Some people even develop flat feet due to an injury to their foot or ankle.