Commonly called a Morton’s Neuroma, this problem begins when the outer coating of a nerve in your foot thickens. This thickening is usually caused by irritation that results when two bones repeatedly rub together (often due to ill-fitting shoes or abnormal bone movement).
The area between the third and fourth toes is the most commonly affected; the area between the second and the third toes is another common irritation point.
Nerve problems due to diabetes or alcoholism may also cause neuroma-like symptoms.
Note: Neuromas are often seen in people who wear tight-fitting shoes.