What are some factors that can cause flat feet?

In most cases, the cause of flat feet (also called pes planus) is unknown. Possible causes or contributors to the condition include:

• Genetic disorders (such as Marfan’s syndrome or Down’s syndrome)

• Tendon abnormalities or injury in the ankle and foot

• Developmental abnormalities, such as incomplete separation of the bones in the foot and ankle

• Aging

• Obesity

• Rheumatoid arthritis