The abductor hallucis muscle is located on the inner border of the foot. This muscle bends the big toe and moves it out to the side. More importantly, it supports the medial longitudinal arch, located on the inside border of the foot. The abductor hallucis is a common area for people to experience foot pain. However, it is often mistaken for other conditions, such as plantar fasciitis.
Source: Verywell Health