Peroneal Tendonitis in the Leg

The peroneal muscles sit on the outer lower leg, while their tendons travel behind the outer ankle to the foot. This arrangement helps control the foot and resist an ankle roll. Irritation may therefore feel like a narrow line of pain beside the ankle, tenderness behind the ankle bone, or aching along the outside edge of the foot. It may increase with stairs, hills, uneven surfaces, or turning the foot outward. Swelling or a clicking sensation can occur. Compare the pattern with [Muscle Soreness After Exercise](/symptoms/muscle-soreness-after-exercise/), particularly if discomfort is widespread rather than focused around one tendon.

Temporarily reduce movements that repeatedly load the outer ankle, and choose level walking with supportive shoes if that is comfortable. Avoid testing the tendon with repeated painful hops or stretches. Gentle ankle movement can prevent stiffness, while a clinician or physiotherapist can prescribe progressive calf, ankle, and balance exercises. Read about [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) and [Strength Training Rehabilitation](/treatments/physiotherapy-and-rehabilitation/strength-training-rehabilitation/). Persistent symptoms may prompt discussion of [Shockwave Therapy](/treatments/physiotherapy-and-rehabilitation/shockwave-therapy/) or [PRP Injection](/treatments/non-surgical-orthopedics/prp-injection/) after assessment.

Arrange medical assessment if pain lasts, returns with ordinary walking, or is accompanied by repeated ankle giving-way. Seek prompt care after a fall, a snap, sudden swelling, bruising, or inability to bear weight. Numbness, a cold foot, or a rapidly changing foot colour requires urgent attention because the issue may not be a tendon irritation alone.

Ask whether the pain follows a tendon, muscle, joint, or nerve; whether you need imaging; and which leg exercises are safe. Ask how footwear, a brace, and a staged return to activity might help.