Why Does Flatfoot Develop? An Explanation from a Foot and Ankle Specialist (DPM) As a foot and ankle specialist, one of the most common questions I hear from patients is: “Why did I develop flat feet?” Many people believe flatfoot is something they are simply born with. However, in clinical practice, I see far more cases of adult-acquired flatfoot than congenital flatfoot. Flatfoot is not just a foot shape — it is often the result of progressive changes in tendons, ligaments, and biomechanics over time. What Is Flatfoot? Flatfoot, also known as pes planus, occurs when the medial arch of the foot collapses or becomes significantly lowered during standing or walking. Some patients have a visible arch when sitting, but the arch disappears once they stand. This is known as flexible flatfoot, the most common form seen in adults. In other cases, [...]