The answer is can be. Many people think they have a flat foot because when they stand the arch flattens out. This is not a flat foot, but indicates too much motion in the foot or pronation. A true flatfoot would not have an arch when you are off your feet either sitting or lying down. This type of flatfoot does have a hereditary component.
A flatfoot can also be somewhat flexible or it can be rigid. It is important to differentiate between the two different types.
If you think you have a flat foot or have symptoms of fatigue, cramping, stumbling in the legs or feet, call the office to schedule an appointment to see if treatment is needed.