5. Inability to bear weight on the ankle is a sign to look out for in peroneal tendonitis.
This can cause a person to be able to not just run, but the inability to walk. In order to get around, a person will need to use crutches until he or she is able to walk on the pain. Even a person still forces him or herself to engage in physical activity with peroneal tendonitis, it will cause the person to go much slower.
With peroneal tendonitis, it can happen suddenly and if this is the case, a runner may be running uphill and all of a sudden unable to go any further because the pain is too much to bear. This could happen because the peroneal tendon itself is so damaged that it resulted in it in becoming tendonitis. The peroneal tendon continued to tear and caused the person to be unable to bear weight on the ankle any longer.