Flat feet is a foot condition in which the arch of the foot either drops or is never developed. About 20-30% of the population generally has flat feet because their arch never formed during growth. While it is common in babies and small children, it can become a problem if the arch never develops. For adults, the development of flat feet can be brought upon by injury, or may even be a result of pregnancy due to the increased elasticity; however, in adults the flat footedness is usually permanent.

Having flat feet can sometimes make it difficult to walk due to the stress it places on the ankles. The general alignment of your legs is thrown off because the ankles move more inward which can cause some major discomfort. This also has a big effect on the knees as many people that have flat feet often have arthritis in that area. However, in many cases, flat feet does not cause any pain and it should not be a cause for concern in that case.

For those that run, there are specific shoes to help realign the ankles with a lot more support and less pronation. The weight shifting in this activity is very quick, so that's why it's important to know if you have flat feet early on in your life, in case of injury down the road.

The wet footprint test can be an indicator to diagnosing flat feet. In this test, the individual would place a flat foot on a surface in order to show a footprint. If there is no indentation or indication of an arch, that person may have flat feet. In all cases, it is best to consult a podiatrist if flat feet is suspected or noticed.

Once flat feet has been diagnosed, it can be treated by walking barefoot in beach-like terrain, or wearing insoles. There are two types of flat feet; one being rigid, where the feet appear to have no arch even when the person is not standing, and the other being flexible where the person appears to have an arch while not standing, but once standing the arch goes away. In the case of flexible flat feet, unless there is pain caused by the condition, there is no need for treatment. However, if it causes pain or in the case of rigid flat feet, exercises and orthotic insoles may be prescribed in order to help the arches develop.

In some cases when the condition is severe and all other methods have been exhausted surgery may be required but this is normally avoided due to a lengthy recovery time and high cost.