Pain on Inside of Ankle: Causes, Diagnosis, and Treatment

Quick answer: Ankle Pain Inside has multiple potential causes including mechanical, neurological, vascular, and inflammatory. The patterns we see most often are overuse, poorly-fitted shoes, and biomechanical imbalance. Red flags requiring urgent evaluation: warmth/redness (infection), inability to bear weight (fracture), and unilateral swelling without injury (DVT). Call (810) 206-1402.

Related Conditions

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Township, MI. Last updated April 2026.

What Causes Pain on the Inside of the Ankle?

Pain on the inside (medial side) of the ankle is a distinct clinical syndrome from lateral ankle pain, with a different set of underlying diagnoses. The medial ankle contains the deltoid ligament complex, the posterior tibial tendon and its sheath, the flexor hallucis longus and flexor digitorum longus tendons, the posterior tibial nerve (which passes through the tarsal tunnel), and the medial malleolus. Damage or inflammation to any of these structures produces medial ankle pain with characteristic patterns that help distinguish the cause.

Posterior Tibial Tendon Dysfunction (PTTD)

Posterior tibial tendon dysfunction is the most common cause of progressive medial ankle and arch pain in adults, and the leading cause of acquired adult flatfoot deformity. The posterior tibial tendon runs behind the medial malleolus and inserts into the navicular and midfoot, providing the primary dynamic support for the medial arch. When the tendon degenerates, partially tears, or completely ruptures, the arch collapses progressively and the hindfoot drifts into valgus (outward tilt).

PTTD is staged I–IV based on severity. Early stages (I–II) present with medial ankle pain, swelling behind the medial malleolus, and early arch collapse—treated with immobilization, custom orthotics with medial arch support, and physical therapy. Advanced stages (III–IV) with rigid flatfoot deformity require surgical reconstruction (tendon transfer, osteotomies, fusion). The classic clinical sign is the inability to perform a single-leg heel rise on the affected side. Anyone with progressive flatfoot and medial ankle pain should be evaluated promptly—PTTD progresses and early intervention produces better outcomes than late-stage reconstruction.

Deltoid Ligament Sprain

The deltoid ligament is the broad medial ankle ligament connecting the medial malleolus to the talus, calcaneus, and navicular. It is much stronger than the lateral ankle ligaments and resists eversion (outward rolling) of the ankle. Pure deltoid ligament sprains are less common than lateral sprains but occur with eversion injuries, severe ankle fractures, and hyperpronation. Medial ankle pain and swelling following a twisting injury with eversion mechanism suggests deltoid injury. Isolated deltoid sprains are typically managed conservatively with bracing and rehabilitation. When a deltoid injury occurs with an ankle fracture (bimalleolar equivalent fracture), surgical repair may be required to restore ankle stability.

Tarsal Tunnel Syndrome

The tarsal tunnel is a fibro-osseous canal behind the medial malleolus through which the posterior tibial nerve passes before dividing into the medial plantar, lateral plantar, and calcaneal nerves. Tarsal tunnel syndrome (TTS) is compression neuropathy of the posterior tibial nerve within this tunnel, producing burning, tingling, or electric pain along the medial ankle and bottom of the foot. Symptoms typically worsen with standing and walking and may radiate into the heel, arch, and toes. Causes include: varicose veins within the tunnel, lipomas, ganglion cysts, bony spurs, flatfoot deformity, and post-traumatic scarring. Diagnosis is confirmed by Tinel’s sign (tapping the tunnel reproduces symptoms), nerve conduction studies, and MRI to identify space-occupying lesions. Treatment addresses the underlying cause: orthotics for flatfoot, surgical decompression for persistent neuropathy or structural compression.

Medial Ankle Impingement

Bony or soft tissue impingement can occur at the medial ankle between the medial malleolus and the talar neck/body. This may follow ankle sprains (forming scar tissue), ankle fractures (resulting in bony spurs or malunion), or develop in athletes with repetitive hindfoot valgus loading. For specialized treatment, see our ankle instability treatment at Balance Foot & Ankle. Medial ankle impingement produces deep aching at the medial ankle joint line that worsens with dorsiflexion and weight-bearing activity. MRI demonstrates edema, synovitis, or bony impingement at the medial gutter. Arthroscopic debridement is effective for soft tissue impingement; bony impingement may require open removal of osteophytes.

Stress Fracture of the Medial Malleolus

Stress fractures of the medial malleolus occur in runners, basketball players, and military personnel—typically presenting as progressive medial ankle pain that starts during activity and eventually becomes present at rest. Unlike acute fractures, stress fractures develop gradually without a specific trauma event. Point tenderness directly over the medial malleolus and pain with the “tuning fork test” (vibration applied to the malleolus) suggest this diagnosis. MRI is the most sensitive imaging modality; X-rays are often normal early. Treatment requires non-weight-bearing immobilization for 6–8 weeks; displaced or non-healing stress fractures may require internal fixation.

Frequently Asked Questions

Medical References & Sources

• American Orthopaedic Foot & Ankle Society — Posterior Tibial Tendon Dysfunction
• PubMed Research — PTTD Treatment and Outcomes
• PubMed Research — Tarsal Tunnel Syndrome

Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Township, Michigan. He diagnoses and treats medial ankle pain from posterior tibial tendon dysfunction, deltoid ligament injuries, tarsal tunnel syndrome, and flatfoot deformity.

Watch: Posterior Tibial Tendonitis — Fix Inside Ankle Pain

Dr. Tom explains the 4-stage progression of posterior tibial tendinopathy — from mild tendon pain to complete flat foot collapse — and the exact treatment approach for each stage, including which exercises prevent progression and which make it worse.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your foot and ankle conditions, our podiatry team at Balance Foot & Ankle can help with expert evaluations and advanced in-office care.