The two biggest causes of splayed feet are obesity and the frequent wearing of unsuitable footwear, for example high heels or narrow, pointed shoes. Splayed feet are more common in adulthood, often as a result of years of poor footwear choices. However children can also have splayed feet as the condition can be genetic.
Medical conditions such as rheumatism or bone necrosis, where a lack of blood supply causes the bone tissue to die, can cause splayed feet. Hypermobility of the ligaments or weakened ligaments are also associated with the development of this foot problem. Other potential causes include bone diseases, paralysis caused by a damaged nervous system and trauma or injury to the foot, ligaments or tendons.