The nerves on the sole of the foot branch off from the tibial nerve after passing through the tarsal tunnel (located beneath the inner ankle). These nerves spread toward the skin of the sole and further divide near the toes to provide sensation to the toes.

Structurally, the foot is divided into two groups: the big toe to the 3rd toe, and the 4th to 5th toes. When the foot’s alignment collapses, the greatest strain occurs between the 3rd and 4th metatarsals. This places repeated pressure on the nerve with every step.

Since the nerve branches just before the toes, pain tends to radiate specifically to the outer side of the 3rd toe and the inner side of the 4th toe.

At Ashi Clinic, if the pain is severe, we begin treatment with corticosteroid injections to reduce inflammation. While this relieves pain temporarily, if the root cause is structural (such as collapsed arches), custom-made insoles (orthotics) or surgery may be necessary. We strongly recommend seeking medical attention before the condition worsens.

Morton’s Neuroma is also commonly caused by wearing high heels or shoes that do not fit properly. In such cases, changing to appropriate footwear is an important part of treatment.