A neuroma is an enlargement of a nerve tissue. This can occur in different parts of the body, but in the foot it commonly occurs between the third and fourth toes as a result of irritation of the nerve. When this neuroma forms it is called a “Morton’s neuroma.”
The nerve between the third and fourth toes is inherently slightly larger than surrounding nerves as it is a continuation of two nerves that have joined together. Because of its size, it is more susceptible to becoming irritated. Common causes of irritation including impact exercises, flatfeet, fat pad atrophy, hammertoes, bunions, and tight shoes. Constant irritation can cause compression of the nerve leading to scar tissue formation and enlargement of the nerve.
Your foot and ankle doctor will document your symptoms and examine your foot. He will determine which factors are contributing to your symptoms and will attempt to reproduce them to confirm the diagnosis. X-rays and other imaging studies may be ordered to further evaluate your foot.