Pain on the Side of Your Foot: Causes and What to Do

What causes pain on the outside (lateral) edge of the foot?

The outer edge of the foot runs from the heel along the fifth metatarsal (the long bone to the base of the little toe). Several structures in this region are commonly injured:

Fifth metatarsal fracture The fifth metatarsal is one of the most commonly fractured bones in the foot — it can fracture from a rolled ankle, a sudden twisting injury, or repetitive stress in high-mileage athletes 2Ref 2Yuen Hang Lo, Sherif Atef (2023).5th Metatarsal Fracture.Fifth metatarsal fractures are common after ankle rolls; Jones fractures (zone 2) carry higher nonunion rates up to 15–30%; nondisplaced fractures heal with 6–8 weeks of conservative management; imaging required for diagnosis.. An acute fracture usually causes immediate severe pain, swelling, and bruising. A stress fracture builds more gradually. Either requires imaging (X-ray) to confirm and professional guidance on weight-bearing. Nondisplaced fractures typically heal in 6–8 weeks with protected weight-bearing; Jones fractures (at the metaphyseal-diaphyseal junction, zone 2) have a higher nonunion rate and sometimes require surgery 2Ref 2Yuen Hang Lo, Sherif Atef (2023).5th Metatarsal Fracture.Fifth metatarsal fractures are common after ankle rolls; Jones fractures (zone 2) carry higher nonunion rates up to 15–30%; nondisplaced fractures heal with 6–8 weeks of conservative management; imaging required for diagnosis..

Peroneal tendinopathy The peroneal tendons run along the outer ankle and behind the lateral malleolus. Overuse, repetitive ankle rolling, or poor footwear can cause pain and swelling along the outer ankle and lateral foot 1Ref 1Martin RL, Davenport TE, Fraser JJ, Sawdon-Bea J, Carcia CR, Carroll LA, Kivlan BR, Carreira D (2021).Ankle Stability and Movement Coordination Impairments: Lateral Ankle Ligament Sprains Revision 2021.Lateral ankle injury is associated with peroneal tendon stress and fifth metatarsal fracture; assessment and imaging are appropriate after ankle rolling injuries; supportive footwear and bracing reduce peroneal tendon load.. Pain tends to be worse with activity, better with rest, and there is often tenderness along the tendon course.

Cuboid syndrome The cuboid is a small bone on the outer midfoot. Repetitive stress or a subtle subluxation causes aching lateral midfoot pain, sometimes recreated by pressing on the cuboid. It is common in dancers and runners.

What causes pain on the inner (medial) side of the foot?

The medial side of the foot includes the arch, the navicular bone, the first metatarsal, and several important tendons:

Posterior tibial tendon dysfunction (PTTD) The posterior tibial tendon runs behind the inner ankle and is the primary dynamic supporter of the arch. Overuse, flat feet, or injury can cause pain and swelling along the inner ankle and arch. Early intervention with orthotics and physical therapy is important — untreated PTTD can progress to complete arch collapse 3Ref 3Moore J, Tafti D (2026).Pes Planus.Posterior tibial tendon dysfunction is the most common acquired cause of adult flatfoot; early conservative treatment with orthotics and physical therapy is recommended; navicular stress fractures require non-weight-bearing immobilization..

Navicular stress fracture The navicular is a small midfoot bone prone to stress injury in high-mileage runners and jumping athletes. Pain is felt over the top and inner midfoot. This is a higher-risk stress fracture that frequently requires non-weight-bearing immobilization; continuing to run risks nonunion 3Ref 3Moore J, Tafti D (2026).Pes Planus.Posterior tibial tendon dysfunction is the most common acquired cause of adult flatfoot; early conservative treatment with orthotics and physical therapy is recommended; navicular stress fractures require non-weight-bearing immobilization..

Bunion-related pain A bunion at the base of the big toe causes pain on the inner forefoot. Footwear adjustment is the primary conservative measure.

Plantar fasciitis The plantar fascia originates at the inner heel. Plantar fasciitis pain is typically at the heel but can radiate into the arch and is often worse with first steps in the morning.

How can I tell if it might be a fracture?

Features that raise concern for a fracture rather than a soft-tissue injury:

• Sudden severe pain that began after a specific misstep, twist, or impact
• Localized bony tenderness — pain concentrated over one spot on a bone
• Swelling and bruising appearing within hours
• Pain at rest that does not ease up
• An inability to bear weight comfortably

If you suspect a fracture, see a clinician or urgent care center promptly for an X-ray 2Ref 2Yuen Hang Lo, Sherif Atef (2023).5th Metatarsal Fracture.Fifth metatarsal fractures are common after ankle rolls; Jones fractures (zone 2) carry higher nonunion rates up to 15–30%; nondisplaced fractures heal with 6–8 weeks of conservative management; imaging required for diagnosis.. Stress fractures may not show on initial X-ray — if suspicion is high, an MRI or bone scan may be needed.

What self-care helps side-of-foot pain?

For soft-tissue causes (tendinopathy, cuboid syndrome) with no suspected fracture:

• Rest and load reduction — cut back on the aggravating activity for 1–2 weeks
• Ice applied for 10–15 minutes wrapped in a cloth, two to three times daily during the acute phase
• Elevation when resting
• Supportive footwear — a firm, well-cushioned shoe with good lateral support reduces peroneal tendon stress; avoid completely flat or flexible shoes 1Ref 1Martin RL, Davenport TE, Fraser JJ, Sawdon-Bea J, Carcia CR, Carroll LA, Kivlan BR, Carreira D (2021).Ankle Stability and Movement Coordination Impairments: Lateral Ankle Ligament Sprains Revision 2021.Lateral ankle injury is associated with peroneal tendon stress and fifth metatarsal fracture; assessment and imaging are appropriate after ankle rolling injuries; supportive footwear and bracing reduce peroneal tendon load.
• Ankle taping or a lace-up ankle brace can offload the peroneal tendons during return to activity

Do not push through significant pain with continued high-impact activity, particularly if there is any bony tenderness.

When should I see a podiatrist for side-of-foot pain?

A podiatrist should evaluate side-of-foot pain when:

• Pain followed a specific injury (twist, fall, or impact) — imaging may be needed 2Ref 2Yuen Hang Lo, Sherif Atef (2023).5th Metatarsal Fracture.Fifth metatarsal fractures are common after ankle rolls; Jones fractures (zone 2) carry higher nonunion rates up to 15–30%; nondisplaced fractures heal with 6–8 weeks of conservative management; imaging required for diagnosis.
• Pain has persisted for more than 2 weeks without clear improvement
• There is swelling, bruising, or difficulty bearing weight
• You have diabetes or peripheral neuropathy — any foot pain needs professional evaluation
• You are a runner or athlete with gradually worsening lateral foot pain — stress fracture is a consideration
• You suspect a posterior tibial tendon problem — worth addressing early, before the tendon deteriorates 3Ref 3Moore J, Tafti D (2026).Pes Planus.Posterior tibial tendon dysfunction is the most common acquired cause of adult flatfoot; early conservative treatment with orthotics and physical therapy is recommended; navicular stress fractures require non-weight-bearing immobilization.

A physical therapist can also help with peroneal tendon rehabilitation and ankle stability work after the cause has been identified.