Sesamoiditis: Pain Under the Big Toe, Causes & Treatment

Quick answer

The sesamoids are two small pea-sized bones embedded in the tendons under your big toe joint. They act like pulleys, helping the big toe push off when you walk. Sesamoiditis is inflammation of these tendons and bones from repetitive pressure. Pain feels like walking on a sharp marble right under the big toe.

How to recognize it

• Dull, achy pain under the ball of the foot, just behind the big toe
• Pain that worsens with push-off — running, jumping, dancing, walking on tiptoes
• Worse barefoot on hard floors and in high heels
• Sometimes swelling and bruising
• Difficulty bending the big toe in severe cases
• One specific spot of tenderness when pressed

What’s actually happening

The sesamoids are tiny — about pea-sized — and they sit on the bottom of the first metatarsal head. Every time you push off your big toe, they bear the load. Repetitive overload causes a spectrum of problems:

• Sesamoiditis — inflammation of the surrounding tendons (most common, mildest)
• Sesamoid stress fracture — cracked sesamoid from chronic overload (more serious)
• Acute sesamoid fracture — direct impact (rare)
• Avascular necrosis — sesamoid bone dies from interrupted blood supply (chronic, severe)
• Bipartite sesamoid — a normal anatomical variant where the sesamoid is in two pieces; can be confused with a fracture on X-ray

A clinician can usually distinguish these with a careful exam, X-rays, and sometimes MRI. A separate consideration is a small surface lesion called porokeratosis plantaris discreta (PPD) — a discrete, deep, disproportionately painful sole keratosis that can sit just under the sesamoid region and be mistaken for sesamoiditis on history alone. Visual inspection of the sole differentiates the two.

Why it happens

• High-impact activities — running, dance (especially ballet on pointe), basketball, sprinting
• Sudden training increases
• Hard surfaces
• Worn-out shoes with thin forefoot cushioning
• High-arched feet — push more weight onto the ball of the foot
• High heels — shift body weight forward
• Direct trauma — landing on the ball of the foot from height

What to do about it

First-line treatment (works for most cases)

• Stop or reduce the offending activity for 4–6 weeks
• Ice the area 15–20 minutes after activity
• NSAIDs for short-term pain relief
• Stiff-soled shoes to limit big toe bending
• Cushioned insole or metatarsal pad placed just behind the ball of the foot to offload the sesamoids
• Tape the big toe to limit upward motion
• Avoid high heels and flexible shoes during recovery

When initial measures aren’t enough

• Walking boot for 2–4 weeks for significant pain
• Custom orthotics with a sesamoid-relief cutout
• Physical therapy for foot strengthening
• Steroid injection — used cautiously around the sesamoids
• Imaging (MRI, bone scan) if pain persists more than 6 weeks

Surgery (rare)

For chronic cases that fail 6+ months of conservative care, surgical options include partial or complete sesamoid removal. Outcomes are generally good but recovery is significant. Removing both sesamoids is avoided when possible since it can affect big toe push-off power.

When to see a clinician

• Pain doesn’t improve after 2–3 weeks of rest and shoe changes
• Sudden severe pain in the ball of the foot (could be a fracture)
• Significant swelling, bruising, or warmth
• Pain limiting walking or daily activity
• You have diabetes or any condition affecting circulation

Prevention

• Build training gradually — sudden mileage or intensity jumps are the #1 trigger
• Replace shoes every 300–500 miles for runners
• Cushioned forefoot in shoes for high-impact activity
• Limit time in high heels
• Address foot mechanics — high arches benefit from cushioned, supportive shoes
• Listen to early symptoms — a few days of rest at the first twinge prevents weeks of recovery