Flatfoot can arise due to various factors. These causes are generally categorized into two main groups: congenital and acquired.

Congenital Causes:

* Genetic Predisposition and Structural Anomalies: Individuals with a family history of flatfoot have a higher risk of developing the condition. Certain bone or joint anomalies present from birth can prevent the proper development of the arch of the foot.
* Vertical Talus: This is a rare congenital anomaly characterized by the talus, one of the ankle bones, being fixed in a vertical position. This condition leads to the flattening of the bottom part of the foot.
* Tarsal Coalition: This is a condition where the tarsal bones of the foot are fused or joined together. This coalition can restrict the flexibility of the foot, leading to pain and flatfoot.
* Neuromuscular Diseases: Diseases affecting the nervous and muscular systems, such as cerebral palsy, muscular dystrophy, or spina bifida, can lead to weakness or imbalance of the foot muscles, thus predisposing to flatfoot.

Acquired Causes:

* Trauma: Past fractures, dislocations, or severe soft tissue injuries to the foot or ankle can disrupt the foot's structure and lead to flatfoot.
* Advanced Age: With the aging process, the ligaments and tendons supporting the arch of the foot can weaken and lose their elasticity, contributing to the development of flatfoot over time.
* Rheumatoid Arthritis: This autoimmune disease can cause inflammation in the foot joints, altering the structure of bones and connective tissues, and leading to flatfoot.
* Posterior Tibial Tendon Dysfunction (Post-tibial Tendon Insufficiency): Damage, inflammation, dysfunction, or rupture of the posterior tibial tendon, one of the main structures supporting the arch of the foot, is one of the most common acquired causes of flatfoot.
* Obesity and Diabetes: Excessive weight increases the load on the arch of the foot, placing extra stress on ligaments and tendons. Diabetes, on the other hand, can negatively affect foot health through nerve damage and circulatory problems, indirectly contributing to the development of flatfoot.