Flexor Hallucis Longus Tendonitis: [Causes, Symptoms & Best Treatment] Flexor Hallucis Longus Tendinitis can cause pain in 3 areas: #1 is the big toe, #2 in the back of the ankle, and #3 in the bottom of the arch. https://youtu.be/C6Glw_3YBsw Flexor Hallucis Longus Tendonitis Overview: Flexor Hallucis Longus Tendinitis: The flexor hallucis longus muscle-tendon unit … Read more