The flexor hallucis longus can cause and contribute to pain in the big toe and ball of the foot. A classic sign of flexor hallucis longus dysfunction is numbness on the bottom of the big toe.
The extensor digitorum brevis muscle can cause pain it the top of the foot. It is also a contributor to hammer toe and claw toe.
The flexor hallucis brevis muscle contributes to pain on the bottom of the foot, just under the big toe. It can also be a factor in plantar fasciitis, hammer toe, turf toe and gout.