By definition, the medical term “neuroma” means “swollen nerve” as derived from “neuro-” (referring to nerve tissue) and “-oma” (referring to tumor). In the simplest of terms a neuroma is a swollen and irritated nerve. A “Morton’s neuroma” refers specifically to a swollen nerve on the bottom of the foot between the third and fourth toes. There are other neuromas in the foot, but most occur on the bottom of the foot where they pass under a ligament before continue their course out into the toes.