Peroneal tendinitis is irritation or inflammation of one or both tendons that run along the outside of the ankle and foot. These tendons help stabilize the ankle and are commonly irritated by repetitive activity or a sudden ankle injury.
Pain along the outside of the ankle
Pain along the outer side of the foot
Swelling
Warmth or redness
Tenderness behind the outer ankle bone
Pain that worsens with activity
Ankle weakness
Reduced balance or stability
Aching or burning outside the ankle
Tenderness behind the ankle bone
Pain during running or walking
Discomfort when turning the foot outward
Ankle feels weak or tired
Pain that improves with rest
Soreness after repetitive activity
Running or repetitive sports
Sudden increase in training
Ankle sprain
Uneven running surfaces
Poorly fitting footwear
High foot arches
Muscle imbalance
Insufficient recovery between workouts
Locate whether pain follows the outside of the ankle
Notice whether activity increases the pain
Check for swelling or warmth
Compare ankle strength with the opposite side
Avoid forceful resistance testing
A self-check cannot confirm a tendon injury
Educational only — not a medical diagnosis.
1Reduce running and painful activities
2Apply wrapped ice
3Elevate the ankle if swollen
4Wear supportive footwear
5Avoid uneven surfaces
6Schedule an evaluation if pain persists
7Use a brace or boot only if recommended
Sudden snapping sensation
Inability to bear weight
Severe swelling or bruising
Visible ankle deformity
Cold, pale, or numb foot
Ankle repeatedly gives way
Pain after significant trauma
Symptoms rapidly become worse
Most cases improve with conservative care
Increase activity gradually
Strengthen the foot and ankle
Improve balance and ankle stability
Wear supportive athletic shoes
Avoid sudden training increases
Complete rehabilitation before returning to sports
For educational purposes only. Not a substitute for medical advice.