Close up of feet in running shoes, person walking.
The peroneal tendons are located in the foot, attaching muscle to bone. They assist with weight bearing and stability.
Peroneal tendonitis occurs when the peroneal tendons become inflamed. This happens when there is an increased load and overuse of the tendons, leading to them rubbing on the bone.

This friction causes the tendons to swell. Over time, the tendons will thicken in size to try and manage the increased load more efficiently.

Peroneal tendonitis is particularly common in athletes and especially runners, as they are more likely to make their feet roll outwards, causing friction between the tendon and bone.

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